Business To Business Fact Sheet

1.    Chiropractic Education:
Summary of Course Hours for Doctor of Chiropractic - NYCC
•    Anatomy 585 hours
•    Biochemistry 75 hours
•    Physiopathology 345 hours
•    Microbiology and Public Health 120 hours
•    Diagnosis 525 hours
•    Diagnostic Imaging 270 hours
•    Clinical Laboratory 75 hours
•    Associated Studies 165 hours
•    Chiropractic Philosophy 135 hours
•    Chiropractic Technique 615 hours
•    Ancillary Therapeutic Procedures 90 hours
•    Clinical Practice Issues 75 hours
•    Clinical Experience and Outpatient Services 1,320 hours
•    Total Core hours 4,380 hours
•    Elective Courses 225 hours
Total 4,620 hours
2.    Education to receive a Diplomate in Rehabilitation:
300 hour postgraduate program  - basically one week-end/month for 3 years
Course material includes:
        (detail list of Delphi topics on acrb.org website)

3.    Testing to receive a Chiropractic License:
National Board examinations Part I, II, III & IV

Note: individual states have different requirements.

4.    Testing to receive a Diplomate in Rehabilitation
a.    3 written 100 question exams at the end of every 100 hour segment
b.    a comprehensive oral examination at the completion of all 300 hours and  
            all 3 written tests

also required is a publishable scientific paper on a rehab topic that is approved by the Board.


5.    The essential difference in a DACRB is not only  knowledge, our training includes active learning of how to apply the advanced diagnostic, soft tissue and treatment techniques as well as cardio, proprioceptive, and muscle co-ordination, facilitation, flexibility, strength, power and speed rehabilitative base-lines and treatment.  Simply put, we are more knowledgeable and more skilled.

6.    The treatment end goal of the DACRB is different than that of the average chiro.  All too often the average chiro’s goal is to foster dependency and create a life-time patient.  The DACRB’s goal is to find and correct the true underlying causes, empower the patient with self care exercises and to release them from care.  This treatment approach is called “active care”.  The patient is included in their treatment – giving patient’s control over their healing process is especially important with chronic pain patients.

By addressing underlying causative issues like poor posture while sitting at a computer or driving, poor patterns of lifting and bending, in-coordination in movement, muscle weakness, poor cardio-vascular fitness, poor balance and general deconditioning – the patient has an opportunity to get better and to maintain a home program that keeps them better.  It is empowering to the patient and cost-effective.

7.    Treatment with a DACRB may include passive care therapies such as  manipulation, mobilization, a variety of soft tissue techniques, acupuncture, ultra-sound, muscle stim, tens …this is especially true in the acute phase of care, but the focus is always on reactivating the patient as soon as possible.  The difference is that a DACRB’s choice of treatment is generally evidence based and progressive.  

This means that the DACRB studies the literature and makes decisions based on evidence that is reported in research studies.  Our treatment is cutting edge and research based.

8.    Treatment is also progressive.  What this means is that treatment changes as the patient improves.  Treatment is based on the phase of care:  Acute, Sub-acute and Chronic.  As the patient improves, their treatment changes accordingly.  As will be discussed later, active care is especially encouraged in chronic patients.

Treatment is also based on the needs and goals of the patient.  A fifty five year old sedentary office worker will not have the same rehab treatment plan as a 25 year old delivery person whose job requires lifting 100 lb boxes off the floor.  The patient’s end goal of treatment is based on the demands of their ADL’s (activitites of daily living) and the patient’s goals (to play 18 holes of golf, lift a 30 lb grandchild or take a kickboxing class)



In some traditional chiro offices not only will the same patient receive the same treatment for their entire program of care – every patient receives the same full spine adjustment, every time.  There is no progression; there is no addressing of posture, function, movement, fitness or deconditioning.  The patient is dependant on the chiro to fix them.  Great for the doc, not so great for the patient.

9.    DACRB’s are trained to evaluate yellow flags and psycho-social issues.  It is 3% that incur 97% of all health care costs.   Training in identifying and properly treating this population is the most cost-effective measure that can be taken.
 
Individuals with a preponderance of “yellow flags” are at heightened risk for developing chronic symptoms and disability (26, 53, 110, 165, 201, 202), and thus require a carefully mapped out management strategy. The strength of the association between “yellow flags” and spinal pain syndromes is reinforced by the prospective studies involving asymptomatic individuals which have shown that they predict both future acute episodes (133) and who will become chronic (240).  Importantly, there is preliminary evidence that psycho-social illness behavior can be improved merely by active rehabilitation alone without a structured cognitive-behavioral component (152).

According to Vlaeyen (259) fear-avoidance behavior leads to deconditioning in the following manner:
Negative views about pain (i.e. viewing it as a threat rather than an annoyance) and its causes lead to catastrophization
Fear and anxiety in turn lead to the tendency to avoid the perceived threat.
Activities of daily living become restricted
Psycho-physical reactivity (sympathetic activation, ↑muscle tension) occurs when activities are encountered which are perceived as harmful.
Fearful patients become hypervigilent since they cognitively put increased attention on possible sources of pain.
Since avoidance behaviors are anticipatory they are self-perpetuated since the individual rarely comes into contact with the actual (non-harmful) consequences of the feared situation.
“Guarded movements” such as an impaired flexion - relaxation phenomenon are correlated with fear-avoidance beliefs NOT actual pain (267)
Anxious patients predict pain earlier during the performance of physical tasks such as ROM or straight leg raise tests (34,37,119,120)
Long standing avoidance of physical activity leads to the “disuse syndrome” or deconditioning syndrome affecting both musculoskeletal and cardiovascular systems
Teaching patients what they can do for themselves is an essential part of caring for the person who is suffering with pain. A simple technique for getting a patient to become active in their own rehabilitation program is to shift them from being pain avoiders to pain managers (25,212).  



*****We have the permission of Dr. Craig Liebenson to use the information and bibliography from his book Rehabilitation of the Spine 2nd Edition.  Please be sure to reference Dr. Liebenson when using any of the information that follows in italics as I have taken it all from Chapter one of his book.

10.          Rather than focusing merely on pathology and symptoms the emphasis in a        
            rehabilitative approach is on recovery and reactivation.

This is very important because research has proven a significant amount of false positives in imaging studies.  If fact, structural findings such as arthritic changes or disc herniations have proven to be incidental findings – NOT the cause of the patient’s pain or their problem.

To clear up the confusion it is important to understand the difference between a structural and functional approach of evaluation and treatment.  Orthopedists traditionally have a structural approach.  They order tests that evaluate the structure of the area in question – X-ray, MRI, CT.  They look for a structural explanation for a patient’s pain and basically treat by either medicating or changing the structure – ie performing surgery.

A functional approach looks to how the system works.  Quality of movement, habits, condition of the tissues, and psycho-social issues are all factored in.

Pain is a multi-dimensional issue that simply cannot be treated successfully if only the structural component is addressed.



The patient-centered reactivation approach is focused on the patient’s dysfunction and distress rather than various signs of often coincidental structural pathology or the patient’s subjective symptoms. A paradigm shift from a traditional biomedical model to a biopsychosocial one has taken firm hold in the spine field. The biopsychosocial approach teaches us that the old adage “let pain be your guide” can actually reinforce illness behavior such as fear-avoidance behavior. The more modern report of findings reassures patients that they do not have a disease (tumor, infection, and fracture) and that staying active will actually speed recovery.  Learning that pain does not always warn of impending harm or damage can empower patients to remain active, avoid disability, and prevent the transition from acute to chronic pain.





Table 1-7 Common Denominators of Successful Care for Chronic Patients (from 102)
•    Thorough physical and functional examination performed
•    Report of findings given
•    Emphasis on self-care
•    Reduce any unfounded fear or anxiety about pain
•    Crystal clear recommendations about activities/exercise
•    Avoidance of excessive “high tech” testing or bed rest prescription

11.  Traditional Chiropractic tends to emphasis passive care (what the doctor does to the patient),  
       where in rehab active care and patient participation are emphasized.

        Traditionally in medicine the advice has been bed rest, muscle relaxant and heat – today  
        research has proven that manipulation, ice and graduated activity are far more effective.

Activity has been shown to be effective for preventing or treating many of the most common chronic ailments in our society today (77). In particular, active care or patient reactivation plays a decisive role in the modern management of disorders of the cardiovascular and locomotor systems (75, 94, 95, 161, 183, 189, 195, 200, 201). From simple, uncomplicated reactivation advice to comprehensive, multidisciplinary rehabilitation the goal is to restore function. The functional goal is an essential hinge for guiding clinicians in the decision-making process.  Biomechanical, neurophysiological, psycho-social and biochemical rationales exist for the benefits of active care. However, the most important justification for making reactivation a primary focus of care is that patients in pain tend to accept the adage “let pain be your guide” with the result being they decondition as a result of their pain.

Excessive immobilization interferes with the healing, coping, and recovery process. Thus, health care professionals are being urged by each successive international guideline on spinal disorders to first perform a diagnostic triage to rule out “red flags” of rare but serious disease, and then to reassure patients of the benign nature of their back pain and the safety and value of gradually resuming activities (2,25,38,94,148,217)
The evidence in favor of reactivation for spine patients is strong. Reactivation advice to resume near normal activities is both safe and effective for acute low back pain (LBP) patients (148). Similarly, early activation has been found to be effective for neck pain following a whiplash injury (18,166,213). Deconditioning normally accompanies acute LBP and its prevention has been shown to reduce recurrence rates (82, 83, 234). Active therapies involving such diverse exercise methods as cognitive-behavioral, stabilization, and strengthening have demonstrated their effectiveness for subacute and chronic LBP (11, 58-60, 83, 94, 95, 113, 128, 150, 190). Therefore, at each phase of the acute to chronic pain continuum patient reactivation has been shown to play a fundamental role.

Active care adheres to biochemical principles by advising patients to avoid the debilitation of bed rest and inactivity while encouraging them regarding both the safety and value of resuming activities with simple biomechanical modifications. Pain and tissue healing are related to metabolic and nutritional issues. The disc is a relatively hypovascular tissue which contributes to its poor healing ability (87). In fact, some pain treatments such as epidural injections while they clearly de-inflame the nerve root and initially reduce pain, have recently been shown to cause a rebound pain later, perhaps as a result of interfering with the body’s natural resorption process for the herniated disc (106).  Resorption or regression of herniated discs – even in large disc herniations - is a common finding and is consistent with the normal process of tissue repair and remodeling (28,29,107,116,172,203). Further evidence for this is the finding that macrophages are present in high concentration with disc herniations (72,78,93). Inactivity slows the recovery process since the disc is dependent on diffusion for its nutrition.

12.  Research has shown several simple functional tests can determine if a patient is more likely to suffer with back pain.  And even more importantly, testing can determine if a patient is  fully recovered and ready to return to work after an injury.  Here is a summary of the recent research:
(It is important to note that every one of these factors is addressed in a rehabilitative evaluation and treatment program and NOT in a traditional Chiropractic approach.)

a.    The back extensors should be slightly stronger than the abs – 1.3-1
b.    There should not be a delayed reaction time of the muscles
c.    There should be good co-ordination of back and abdominal muscles and the
            ability to activate and isolate the low abdominal muscles.
d.    Underactivity of agonists and overactivity of synergists was able to discriminate pain patients with 88% accuracy.
e.    Decreased endurance of the trunk extensors has not only been shown to correlate with pain, but prospectively to predict recurrences as well as first time onset of episodes in healthy individuals
    Decreased endurance of the deep neck flexors has been correlated with chronic neck pain and headaches.
f.    Poor balance has been related to LBP and also prospectively correlated with future LBP
g.    Bed rest for more than 2-3 days can foster deconditioning and is not advised.

a.    A reduced ratio of trunk extensor to flexor strength/endurance discriminates between LBP patients and control subjects. The normal ratio is approximately 1.3:1 with the extensors being stronger (158). Mayer and colleagues demonstrated that patients chronically disabled with LBP frequently had a decreased trunk extensor/flexor strength ratio and that a comprehensive, multidisciplinary functional restoration program (including an emphasis on trunk extensor training) successfully returned many of these individuals to work. (161)



b.    Altered reaction times of muscles have been correlated with LBP. Wilder showed that slow reaction time, decreased peak output, and increased after discharges when irregular load is handled is typical of LBP subjects (272). Following treatment the reactions improved.  Sitting was shown to disturb these variables and a brief walking break to improve them again.

A recent study by Leinonen utililzing similar methods as Wilder reported that there was a slower reaction time to anticipated, sudden loading in patients with sciatica than in healthy controls (126). This was theorized as due to an impairment in the patient’s central processing of information. It was concluded that  chronic sciatica can impair lumbar feed-forward control.  

Radebold and colleagues also found that a motor control signature discriminates LBP patients from asymptomatics - namely a slow reaction time, increased muscle activation, and slow relaxation of muscles following unexpected perturbations (33,204,205).

 With voluntary upper or lower limb movements <TXT>A delayed activation of the transverse abdominus muscle during arm or leg movements has been found to distinguish LBP patients from asymptomatic individuals (85, 86). A rehabilitation program designed to improve this dysfunction has been shown to be effective for chronic LBP patients (190).

To external visual stimuli <TXT>Reaction times to visual stimuli have been shown to be slower in chronic LBP patients than in asymptomatic individuals (143,144,236).

c.    Incoordination <TXT>Incoordination is correlated with LBP.  Paarnianpour showed that a loss of control of the center of rotation during resisted trunk movements in the sagittal plane occured in LBP patients, but not in normals (193). Increases in rotation and side bending and a decrease in sagittal motion occurred during the resisted  movement. Similarly, Grabiner reported that asymetric muscle output during isokinetic resisted trunk extension did not reduce torque production, but was abnormal (65).

O’Sullivan found that an increased ratio of rectus abdominus to transverse abdominus/oblique abdominal activation is correlated with LBP (190). Control subjects were able to preferentially activate the internal oblique and transverse abdominus muscles without significant rectus abdominus activation while LBP patients could not do this. Individuals who automatically perform a trunk curl fast instead of slow also showed a greater ratio of rectus abdominus to transverse abdominus/oblique abdominal activation (191).

d.    Edgerton found that an altered muscle activation ratio of synergist spinal muscles during a variety of motor tasks was common in chronic neck pain patients after whiplash injury (44).  Underactivity of agonists and overactivity of synergists was able to discriminate pain patients with 88% accuracy. He stated, “The nervous system apparently can detect a reduced capacity to generate force from a specific muscle or group of muscles and compensate by recruiting more motoneurons. This compensation can be made by recruiting motor units from an uninjured area of the muscle or from other muscles capable of performing the same tasks…” Nedherhand found that a decreased ability to relax the upper trapezius muscles during static tasks and following exercise distinguished between chronic Whiplash Associate Disorder (WAD) classification II patients and healthy control subjects (181).

Jull has shown that a cranio-cervical flexion test can differentiate both chronic headache and chronic neck pain post-whiplash patients from asymptomatic individuals (100,101). During the test patients showed overactivation of the superficial neck muscles (sternocleidomastoid), an inability to hold a constant pressure with the head against a pressure sensor at all test levels, and an inability to target higher pressure levels (26-30mmHg) (230). Individuals with mild or moderate/severe pain and disability had significant overactivity of the superficial neck muscles during the flexion test at 1 month (230). This persisted at 3 months regardless of whether or not pain persisted (230).  Treatment directed at improving cranio-cervical flexion has recently been shown to achieve lasting results both in terms of improved function and reduced symptoms

e.    Endurance has been shown to correlate with LBP. Decreased endurance of the tunk extensors has not only been shown to correlate with pain (13,124,184), but prospectively to predict recurrences (13) as well as first time onset of episodes in healthy individuals (88,142). Some studies have disputed that this test correlates with low back trouble (238). The test, if performed in the manner described by Biering-Sorensen, has been shown to be reliable in various populations – asymptomatic (124), symptomatic (175), and those with a past history of LBP (124). One study claimed the test was unreliable, but a small sample (12 subjects) and a different procedure utilizing a Roman Chair was utilized (160).

Decreased endurance of the deep neck flexors has been correlated with chronic neck pain and headaches (10,221,243,268).

f.    Balance Ability: Balance deficits have been demonstrated to be related to LBP (30,145,238, 176). Byl showed that excessive anterior to posterior body sway on an unstable surface or poor single leg standing balance ability is correlated with LBP (30). Mok has shown that when compared with age and gender matched pain-free controls, study participants with LBP had poorer balance (176). Poor balance was also prospectively correlated with future LBP by Takala (238).

g.      Bed Rest -Of all the traditional treatment methods none has fared worse than bed rest.   
        Deyo performed a controlled clinical trial which compared 2 days of bed rest against 2      
       weeks and concluded that not only was 2 days of bed rest as effective as 2 weeks, but the   
       negative effects of prolonged immobilization were also limited (41). A Cochrane
      Collaboration review concluded that bed rest (74):has no positive effect for LBP
may have slightly harmful effects yields no improvement with 7 days over 2-3 days in LBP or sciatica

The Paris Task Force on Back Pain recommended that “bed rest should neither be enforced nor prescribed, but may be authorized if pain indicates it (1). If authorized, it should be of as short a duration as possible and should be intermittent rather than continuous. After 3 days of bed rest, patients must be strongly encouraged to progressively resume their activities.” The Danish guidelines concurred suggesting that bed rest can be considered a pain relieving measure for 1-2 days for severe pain (38).

When recommended for severe pain it should be made clear that brief bed rest is  as a consequence of the pain, but not a treatment for the pain (217).
    
What follows is a summary of some evidence comparing active care to “tincture of time” or other modalities for the treatment of spine related conditions. The most common criteria for recovery are symptom reduction and return to work. But, other criteria such as satisfaction, health care utilization, activity intolerances, and distress have also been applied.  Active care includes a variety of approches from basic advice to stay active to supervised machine-based exercise routines.  

13.    Acute Phase (first 4-6 weeks)  -  Advice to Stay Active is proven effective:
Information and advice emphasizing the value of fitness and the safety of resuming activities Achieved superior outcomes to advice which reinforced rest, activity restrictions and the notion that the spine was injured or damaged (arthritis, herniated disc) (25). Reassuring workers and encouraging resumption of ordinary activities was superior to medication, bed rest or mobilization exercises (148). Little et al. recently demonstrated that educational advice which encourages early exercise (not just advice to stay active) or endorsement by a physician of a self-management booklet has been shown to increase patient satisfaction and function while reducing pain (137).

Studies evaluating behavioral strategies have also shown substantial improvements with early active care approaches. Early behavior modification through exercise reduced disability 1 year later than in the control group (50). An 8 fold reduction in the risk of becoming chronic was achieved from information designed to reduce fear and anxiety and provide self-care advice (129). A recent randomized, controlled trial verified the results of these early studies (134).

14.       Many of the most popular treatments for acute LBP lack evidence of effectiveness.
The recent Danish guidelines (38) (p60) state, “One of the greatest errors in the treatment of LBP in this century has been the unquestioned usage of passive treatments, often-times initiated when spontaneous recovery has already begun.” Passive modalities such as electrical muscle stimulation were recommended only as optional. Such passive modalities may engender higher levels of patient satisfaction, but they have not been demonstrated to improve outcomes related to recovery (89). Thus, similar to taking x-rays, patients may like it but since it doesn’t improve outcomes better patient education about appropriate management techniques for acute LBP are needed (47,98,111).
15.    Subacute Phase Reactivation and Exercise (from 4 – 12 weeks)
The subacute phase is the ideal time for both active and aggressive treatment (52,132,266). In cases of disability the return to work curve declines steeply between 6 and 20 weeks (227, 266). The longer patients with LBP are off work, the more difficult it is for them to return to work (227, 266). For this reason most guidelines recommend exercise therapy/fitness for LBP of greater than 6 weeks duration (38). In patients with subacute LBP light multidisciplinary treatment programs have been shown to be more effective than treatment as usual for return to work (73,94,95,128,138). A Cochrane Collaboration review concluded that there is moderate evidence that multidisciplinary rehabilitation is effective for subacute LBP (105).

Two studies found that either lay-led or professional-led instruction in self care and worry reduction were both successful in reducing back-related worry, fear-avoidance beliefs, pain severity and activity intolerances (173,260). A long term follow-up study led by Indahl focused on education designed to reduce fear (94, 95). Patients were informed that light activity would not injure the disc, but instead speed recovery. The return to work rate was double the control group. Hagen reported at 1 year follow-up that light activity, education about the benign nature of pain, and encouragement to stay active achieved a significantly greater return to work rate than those who received more traditional management (73). These studies utilized graded exposures which means that patients exercise included movements which were perceived as threatening by the patient. Loisel’s group demonstrated that a work site visit improved the success of the program (138,139).

A recent randomized, controlled trial of 160 LBP patients found that adding manual therapy to reactivation advice was shown to be superior to reactivation advice alone (68). Similarly, a  pragmatic study of “best care” vs manipulation followed by exercise, exercise alone, or manipulation alone for 1334 subacute LBP patients in England  was recently published (247). “Best care” involved giving advice to gradually resume near normal activities along with a copy of The Back Book. Relative to “best care” the manipulation followed by exercise group had the best patient outcomes (disability, pain, adverse back pain beliefs, and general physical health) at both 3 and 12 month follow-up, whereas the manipulation alone group was the most cost-effective (247, 248).
16.    Chronic Phase Reactivation and Exercise (after 12 weeks)
A large number of well-controlled studies have shown that exercise is an effective treatment for chronic LBP. A Cochrane Collaboration review of exercise (257) concluded that, “…there is strong evidence (Level 1) that exercise therapy is more effective than usual care by a general practitioner for chronic low back pain.” Two recent studies strongly suggest that exercise has a long-term beneficial effect in the management of chronic LBP (83,234). Both studies utilized exercise programs which focused on training coordinated movements and included evaluation of results during a prolonged follow-up period.

O’Sullivan et al. showed that specific spine stabilization exercises achieved superior outcomes to isotonic exercises in chronic patients with spondylolysthesis (190). Manniche et al demonstrated that an isotonic regime emphasizing endurance training was successful in improving outcomes (150). In a large, randomized controlled clinical trial Timm showed that exercise was superior to passive care in treating failed back surgery patients (242). In this study a further comparison of exercise types showed that low-tech exercise (McKenzie and stabilization) was superior to high-technology exercise (isotonics & Cybex).

The McKenzie method was shown to be as effective as an isotonic strengthening program in a recent randomized, controlled trial of subacute and chronic patients (pain duration of at least 8 weeks) (199). The course of treatment was 8 weeks of supervised training. McKenzie was superior at a 2 month follow-up, but no differences were noted at 8 month follow-up.
The Quebec Whiplash Associated Disorders (WAD) guidelines recommended early, active intervention (including manipulation) (227) (see table 1-8).

Treatment following these guidelines has recently been shown to be much more effective than traditional passive based care (213). Clinically important symptoms at 6 months post-accident were present in only 10% of properly managed patients (early active intervention with submaximal movements identified by McKenzie evaluation) as compared with the greater than 50% of those given standard care (soft collar, initial rest, gradual mobilization).
Jull has recently demonstrated that a combination of manual therapy and exercise training which improves deep neck flexor function correlates with improved recovery in chronic neck pain patients following a whiplash injury (102).




Here is a complete list of references from Chapter One – I’m sure you will find points of interest that may be useful in addition to those referenced above.
References
1.    Abenheim L, Rossignol M, Valat JP, Nordin M, Avouac B, Blotman F, Charlot J, et al. The role of activity in the therapeutic management of back pain: Report of the International Paris Task Force on Back Pain. Spine 2000;25(4):1S-33S.
2.    Agency for Health Care Policy and Research (AHCPR). Acute low-back problems in adults. Clinical Practice Guideline Number 14.  Washington DC, US Government Printing, 1994.
3.    Alaranta H, Tallroth K, Soukka A, Heliaara M. Fat content of lumbar extensor muscles in low back disability: a radiographic and clinical comparison. Journal of Spinal Disorders 1993;6: 137-140
4.    Alaranta H, Rytokoski U, Rissanen A, et al. Intensive physical and psychosocial training program for patients with chronic low back pain: a controlled clinical trial. Spine 1994; 19: 1339–49.   
5.    Al-Obaidi SM, Nelson RM, Al-Awadhi S, Al-Shuwaie N. The role of anticipation and fear of pain in the persistence of avoidance behavior in patients with chronic low back pain. Spine 2000;25(9):1126-1131.
6.    American Medical Association. Guides to the evaluation of permanent impairment. 4th ed. Chicago: American Medical Association, 1994.
7.    Arendt-Nielson L, Graven-Nielson T,  Svarrer H, Svensson P. The influence of low back pain on muscle activity and coordination during gait. Pain 1995;64:231-240.
8.    Asghari A, Nicholas MK. Pain self-efficacy beliefs and pain behaviour. A prospective study. Pain 2001;94:85-100.
9.    Balderson BHK, Von Korff M. The stepped care approach to chronic back pain. In Linton  SL (ed) New avenues for the prevention of chronic musculoskeletal pain and disability. Elsevier, Amsterdam, 2002.
10.    Barton PM, Hayes KC. Neck flexor muscle  strength, and relaxation times in normal subjects and subjects with unilateral neck pain and headache. Arch Phys Med Rehabil 1996; 77:680-687.
11.    Bendix AF, Bendix T, Labriola M, et al. Functional restoration for chronic low back pain: two-year follow-up of two randomized clinical trials. Spine 1998; 23: 717–25.   
12.    Biedermann HJ, Shanks GL, Forrest WJ, et al. Power spectrum analyses of electromyographic activity discriminators in the differential assessment of patients with chronic low back pain. Spine 1991; 16 (10): 1179-84.
13.    Biering-Sorensen F. Physical measurements as risk indicators for low-back trouble over a one-year period. Spine 1984;9:106-119.
14.    Boden SD, Davis DO, Dina TS, et al: Abnormal magnetic-resonance scans of the lumbar spine in asymptomatic subjects. J Bone Joint Surg [Am] 1990;72:403.
15.    Boden SD. McCowin PR, Davis Do, Dina TS, Mark AS, Wiesel S. Abnormal magnetic-resonance scans of the cervical spine in asymptomatic subjects. J Bone Joint Surg 1990a;72A:1178-1184.
16.    Bogduk N. What’s in a name? The labeling of back pain. Medical Journal of Australia 2000;173:400-1.
17.    Booth FW. Physiologic and biochemical effects of immobilization on muscle. Clin Orthop 1987;219:15-20.
18.    Borchgrevink GE, Kaasa A, McDonoagh D, et al. Acute treatment of whiplash neck sprain injuries. Spine 1998;23:25-31.
19.    Borkan JM, Koes BW, Reis R, Cherkin DC. A report from the second international forum for primary care research on low back pain: Reexamining priorities. Spine 1998;23:1992-6.
20.    Borkan J, Reis S, Hermoni D,et al.Talking about the pain:a patient-centered study of low back pain in primary care.Soc Sci Med 1995;40:977–88.   
21.    Borkan J, Van Tulder M, Reis S, Schoene ML, Croft P, Hermoni D. Advances in the field of low back pain in primary care: A Report from the Fourth International Forum. Spine 2002;27:E128-E132.
22.    Bouter LM, Pennick V, Bombarider C, Editorial Board of the Back Review Group. Cochrane back review group. Spine 2003;28:1215-1218.
23.    Brandt-Zawadzki MN, Jensen MC, Obuchowski N, et al. Interobserver and intraobserver variability in intrepretation of lumbar disc abnomralities: a comparison of two nomenclatures. Spine 1995;20:1257-1263.
24.    Brumagne S, Cordo P, Lysens R, Verschueren S, Swinnen S. The role of paraspinal muscle spindles in lumbosacral position sense in individuals with and without low back pain. Spine 2000;25:989-994.
25.    Burton K, Waddell G. Information and advice to patients w/ back pain can have a positive effect. Spine 1999;24:2484-2491.
26.    Burton AK, Tillotson K, Main C, Hollis M. Psychosocial predictors of outcome in acute and sub-acute low back trouble. Spine 1995;20:722-8.
27.    Burton AK, Waddell G. Educational and informational approaches. In Linton  SL (ed) New avenues for the prevention of chronic musculoskeletal pain and disability. Elsevier, Amsterdam, 2002.
28.    Bush K, Cowan N, Katz DE, et al: The natural history of sciatica associated with disc pathology: A prospective study with clinical and independent radiologic follow-up. Spine 1992;17:1205.
29.    Bush K, Chaudhuri R, Hillier S, Penny J. The pathomorphologic changes that accompany the resolution of cervical radiculopathy. Spine 1997;22(2):183-187.
30.    Byl NN, Sinnot PL. Variations in balance and body sway. Spine 1991;16:325-330.
31.    Cholewicki, J., and McGill, S.M.,  Mechanical stability of the in vivo lumbar spine:  Implications for injury and chronic low back pain, Clin. Biomech. 1996;11(1):1-15.
32.    Cholewicki J, Panjabi MM, Khachatryan A. Stabilizing function of the trunk flexor-extensor muscles around a neutral spine posture. Spine1997;22: 2207-2212.
33.    Cholewicki J, Simons APD, Radebold A. Effects of external loads on lumbar spine stability. Journal of Biomechanics 2000;33:1377-1385.
34.    Ciccione DS, Just N. Pain expectancy and work disability in patients with acute and chronic pain: A test of the fear avoidance hypothesis. Journal of Pain 2001; 2: 181-194.
35.    Ciccone DS, Just N, Bandilla EB: Non-organic symptom reporting in patients with chronic non-malignant pain. Pain 1996;68:329-341.
36.    Council JR, Ahern DK, Follick MJ, Kline CL: Expectancies and functional impairment in chronic low back pain. Pain 1988;33:323-331.
37.    Crombez G, Vlaeyen JW, Heuts PH,et al. Pain-related fear is more disabling than pain itself: evidence on the role of pain-related fear in chronic back pain disability. Pain 1999;80:329–39.   
38.    Danish Health Technology Assessment (DIHTA). Manniche C et al. Low back pain: Frequency Management and Prevention from an HAD Perspective, 1999.
39.    DeFier M, Peters ML, Vlaeyen JWS. Fear of pain, physical performance, and attentional processes in patients with fibromyalgia. Pain 2003; 104:121-130.
40.    Deyo RA. Back pain and disability conference, New York City as reported in The Back Letter 2001;16:13.
41.    Deyo RA, Diehl AK, Rosenthal M: How many days of bed rest for acute low back pain?. N Engl J Med 1986;315:1064.
42.    Donchin M, Woolf O, Kaplan L, et al. Secondary prevention of low-back pain: A clinical trial. Spine 1990; 15: 1317–20.   
43.    Dworkin S. Perspectives on psychogenic versus biogenic factors in orofacial and other pain states. American Pain Journal 1992;1:172-180
44.    Edgerton VR. Wolf SL, Levendowski DJ, Roy RR. Theoretical basis for patterning EMG amplitudes to assess muscle dysfunction. Med Sci Sp Exer 1996;28:744-751.
45.    Elfving B, Dedering A, Nemeth G. Lumbar muscle fatigue and recovery in patients with long-term low-back trouble – electromyography and health-related factors. Clinical Biomechanics 2003;18:619-630.
46.    Erhard RE, Delitto A. Relative effectiveness of an extension program and a combined program of manipulation and flexion and extension exercises in patients with acute low back syndrome. Phys Ther 1994; 74:1093-1100.
47.    Espeland A, Baerheim A, Albrektsen G, Korsbrekke K, Larsen JL. Patients views on importance and usefulness of plain radiography for low back pain. Spine 2001;26:1356-1363.
48.    Faas A, Chavannes AW, van Eijk J Th M, Gubbels JW: A randomized, placebo-controlled trial of exercise therapy in patients with acute low back pain. Spine 1993: 18:1388-1395.
49.    Fordyce WE. Lansky D, Calshyn DA, Shelton JL, Stolov WC, Rock DL. Pain measurement and pain behavior. Pain 1984;18:53-69.
50.    Fordyce WE, Brochway JA, Bergman JA, et al: Acute back pain: A control-group comparison of behavioral vs. traditional management methods. J Behav Med 1986;9:127.
51.    Fordyce WE (ed) Back pain in the workplace: management of disability in non-specific conditions. International Association for the Study of Pain (IASP) Press, Seattle 1995.
52.    Frank J, Sinclair S, Hogg-Johnson S, Shannon H, Bombardier C, Beaton D, Cole D. Preventing disability from work-related low-back pain. New evidence gives new hope - if we can just get all the players onside. Canadian Medical Association Journal 1998; 158: 1625-1631.
53.    Fransen M, Woodward M, Norton R, Coggan C, Dawe M, Sheridan N. Risk factors associated with the transition from acute to chronic occupational back pain. Spine  2002;27:92-98
54.    Fritz JM, George SZ, Delitto A. The role of fear-avoidance beliefs in acute low back pain: relationships with current and future disability and work status. Pain 2001;94:7-15.
55.    Fritz JM. George S. The use of a classification approach to identify subgroups of patients with acute low back pain. Spine ;2000 :1:106-114.
56.    Fritz JM, Delitto A, Vignovic M,et al. Interrater reliability of judgements of the centralisation phenomenon and status change during movement testing in patients with low back pain. Arch Phys Med Rehabil 2000;81:57–60.  
57.    Fritz JM, Delitto A Erhard RE. Comparison of classification-based physical therapy with therapy based on clinical practice guidelines for patients with acute low back pain: a randomized clinical trial. Spine, 2003;28:1363-1371.
58.    Frost H, Lamb SE, Shackleton CH. A functional restoration programme for chronic low back pain: A prospective outcome study. Physiotherapy 2000;86(6):285-293.
59.    Frost H, Lamb S, Klaber Moffett JA, Faribank JCT, Moser JS. A fitness programme for patients with chronic low back pain: Two-year follow-up of a randomised controlled trial. Pain 1998;75:273-279.
60.    Frost H, Klaber Moffett JA, Moser JS, Faribank JCT. Randomized controlled trial for evaluation of fitness programme for patients with chronic low back pain. British Medical Journal 1995;310:151-154.
61.    Gardner-Morse MG, Stokes IAF. The effects of abdominal muscle coactivation on lumbar spine stability. Spine 1998;23:86-92.
62.    Gaudino WA, Matheson LM, Mael F. Development of the functional assessment taxonomy. J Occupational Rehabilitation. 2001;11:155-175.
63.    Geisser ME, Haig AJ, Theisen ME. Activity avoidance and function in persons with chronic back pain. Journal of Occupational Rehabilitation 2000;10:215-228.
64.    Gill KP, Callaghan MJ. The measurement of lumbar proprioception in individuals with and without low back pain. Spine 1998; 23 (3): 371-7.
65.    Grabiner MD, Koh TJ, Ghazawi AE. Decoupling of bilateral paraspinal excitation in subjects with low back pain. Spine 1992;17:1219.
66.    Granata KP, Marras WS. Cost-benefit of muscle cocontraction in protecting against spinal instability. Spine 2000;25:1398-1404.
67.    Gronblad M, Hurri, Kouri JP. Relationships between spinal mobility, physical performance tests, pain intensity and disability assessments in chronic low back pain patients. Scan J Rehabili Med 1997;29:17-24.
68.    Grotle M, Vollestad NK, Veierod MB, Ivar Brox J. Fear-avoidance beliefs and distress in relation to disability in acute and chronic low back pain. Pain 2004;112:343-352.
69.    Grunnesjo MI, Bogefeldt JP, Svardsudd KF, Blomberg SIE. A randomized controlled clinical trial of stay-active versus manual therapy in addition to stay-active care: Functional variables and pain. JMPT 2004;27:431-441.
70.    Gundewall B, Liljeqvist M, Hansson T. Primary prevention of back symptoms and absence from work: A prospective randomized study among hospital employees. Spine 1993; 18: 587–94.   
71.    Gunning, J., Callaghan, J.P., McGill, S.M., The role of prior loading history and spinal posture on the compressive tolerance and type of failure in the spine using a porcine trauma model, Clin. Biomech 2001;16:471-480.
72.    Habtemariam A, Gronblad M, Virri J, et al. A comparative immunohistochemical study of inflammatory cells in acute-stage and chronic-stage disc herniations. Spine 1998; 23: 2159–65.   
73.    Hagen EM, Eriksen HR, Ursin H. Does early intervention with a light mobilization program reduce long-term sick leave for low back pain? Spine 2000;25:1973-1976.
74.    Hagen KB, Hilde G, Jamtvedt G, Winnem MF. The Cochrane review of bed rest for acute low back pain and sciatica. Spine 2000;25:2932-2939.
75.    Hakim AA, Curb D, Petrovitch H, Rodrigues BL, Yano K, Ross W, et al. Effects of walking on coronary heart disease in elderly men: The Honolulu Heart Program. Circulation 1999;100:9-13.
76.    Hallgren R, Greenman P, Rechtien J: Atrophy of suboccipital muscles in patients with chronic pain: A pilot study. J Am Osteopath Assoc 1994;94:1032-1038.
77.    Hamilton MT, Booth FW. Skeletal muscle adaptation to exercise: a century of progress. J Appl Physiol 2000;88:327-331.
78.    Haro H, Komori H, Okawa A, et al. Sequential dynamics of monocyte chemotactic protein-1 expression in herniated nucleus pulposus resorption. J Orthop Res 1997; 15: 734–41.
79.    Hasenbring M. Attentional control of pain and the process of chronification. In: Sandkuhler J, Bromm B, Gebhart GF, editors. Progress in brain research, vol 129. Amsterdam: Elsevier; 2000.l, p. 525-34.
80.    Hashemi L, Webster BS, Clancy EA, Volinn E. Length of disability and cost of workers’ compensation low back pain claims. J Occup Environ Med 1998;40:261-269.
81.    Heikkila H, Astrom PG. Cervicocephalic kinesthetic sensibility in patients with whiplash injury. Scand J Rehab Med 1996;28:133-138.
82.    Hides JA, Stokes MJ, Saide M, Jull Ga, Cooper DH. Evidence of lumbar multifidus muscle wasting ipsilateral to symptoms in patients with acute/subacute low back pain. Spine 1994;19(2):165-172
83.    Hides JA, Jull GA, Richardson CA. Long-term effects of specific stabilizing exercises for first-episode low back pain. Spine 2001;26:e243-e248.
84.    Hides JA, Richardson CA, Jull GA. Multifidus muscle recovery is not automatic after resolution of acute, first-episode of low back pain. Spine 1996;21(23):2763-2769.
85.    Hodges PW, Richardson CA. Altered trunk muscle recruitment in people with low back pain with upper limb movement at different speeds. Arch Phys Med Rehabil 1999; 80 (9): 1005-12.
86.    Hodges PW, Richardson CA. Delayed postural contraction of transversus abdominis in low back pain associated with movement of the lower limb. J Spinal Disord 1998; 11 (1): 46-56.
87.    Holm S, Nachemson A: Nutritional changes in the canine intervertebral disc after spinal fusion. Clin Orthop 1982; 169:243-258.
88.    Holm SM, Dickenson AL. A comparison of two isometric back endurance tests and their predictability of first-time back pain: A pilot study. Journal of the Neuromusculoskeletal System, 2001;9(2):46-53.
89.    Hurwitz EL, Morgenstern H, Harber PL, Kominski GR, Belin TR, Yu F, Adams AH. The effectiveness of physical modalities among patients with low back pain randomized to chiropractic care: Findings from the UCLA low back pain study. J Manip Physiol Ther 2002;25:10-20.
90.    Hussein TM, Simmonds MJ, Etnyre B, et al. Kinematics of gait in subjects with low back pain with and without leg pain. Scientific Meeting & Exposition of the American Physical Therapy Association. Washington, DC , 1999
91.    Hussein TM, Simmonds MJ, Olson SL, et al. Kinematics of gait in normal and low back pain subjects. American Congress of Sports Medicine 45th Annual Meeting. Boston, MA , 1998.
92.    ICDH-2. International Classification of Functioning and Disability. Beta-2 Draft. Full Version, World Health Organization, Geneva. 1999.
93.    Ikeda T, Nakamura T, Kikuchi T, et al. Pathomechanism of spontaneous regression of the herniated lumbar disc: Histologic and immunohistochemical study. J Spinal Disord 1996; 9: 136–40.   
94.    Indahl A. Velund L, eikeraas O. Good prognosis for low back pain when left untampered: A randomized clinical trial. Spine 1995;20:473-7.
95.     Indahl A, Haldorsen EH, Holm S, Reikeras O, Hursin H. Five-year follow-up study of a controlled clinical trial using light mobilization and an informative approach to low back pain. Spine 1998;23:2625-2630.
96.    Jarvik JG, Deyo RA. Imaging of lumbar intervertebral disc degeneration and aging, excluding disc herniations. Radiology Clinics of North America 2000;38:1255-66.
97.    Jarvik JG, Hollingworth W, Heagerty P, Haynor DR, Deyo RA. The longitudinal assessment of imaging and disability of the back (LAIDBack) study. Spine 2001;26:1158-1166.
98.    Jarvik JG. Editorial. Don’t duck the evidence. Spine 2001;26:1306-1307.
99.    Jensel MC, Brant-Zawadzki MN, Obuchowki N, et al: Magnetic resonance imaging of the lumbar spine in people without back pain. N Engl J Med 1994;2:69.
100.    Jull GA. Deep cervical flexor muscle dysfunction in whiplash. Journal of Musculoskeletal Pain 2000;8:143-154.
101.    Jull G, Barret C, Magee R, Ho P. Further clinical clarification of the muscle dysfunction in cervical headache. Cephalgia 1999;19: 179-185.
102.    Jull G, Trott P, Potter H, Zito G, Niere K, Emberson J, Marschner I, Richardson C. A randomised control trial of physiotherapy management of cervicogenic headache.  Spine 2002;27:1835-1843.
103.    Kankaanpää M, Taimela S, Airaksinen O, Hanninen O. The efficacy of active rehabilitation in chronic low back pain: Effect on pain intensity, self-experienced disability, and lumbar fatigability. Spine 1999; 24: 1034-42.
104.    Kankaanpää M, Taimela S, Laaksonen D, et al. Back and hip extensor fatigability in chronic low back pain patients and controls. Arch Phys Med Rehabil 1998; 79: 412-7.
105.    Karjalainen K, Malmivaara A, van Tulder M, Roine R, Jauhianen M, Hurri H, Koes B. Multidisciplinary biopsychosocial rehabilitation for subacute low back pain in working age adults. A systematic review within the framework of the Cochrane Back Review Group. Spine 2001;26:262-269.
106.    Karppinen J, Malmivaara A, Kurunlahti M, Kyllonen E, Pienimakii TU, Nieminen P, Ohinmaa A, et al. Periradicular infiltration for sciatica. A randomized controlled trial. Spine 2001;26:1059-1067.
107.    Kawaguchi S, Yamashita T, Yokogushi K, Murakami T, Ohwada O, Sato N. Immunophenotypic analysis of the inflammatory infiltrates in herniated discs. Spine 2001;26:1209-1214.
108.    Käser L, Mannion AF, Rhyner A, Weber E, Dvorak J, Müntener M. Active therapy for chronic low back pain.  Part 2. Effects on Paraspinal Muscle Cross-Sectional Area, Fiber Type Size, and Distribution. Spine 2001;26:909-919.
109.    Kellett KM, Kellett DA, Nordholm LA. Effects of an exercise program on sick leave due to back pain. Phys Ther 1991; 71: 28 3–93.   
110.    Kendall NAS, Linton SJ, Main CJ. Guide to assessing psychosocial yellow flags in acute low back pain: Risk factors for long-term disabilty and work loss. Accident Rehabilitation & Compensation Insurance Corporation of New Zealand and the National Health Committee. Wellington, NZ (http://www.nhc.govt.nz), 1997.
111.    Kendrick D, Fielding K, Bentler E, Kerslake R, Milller P, Pringle M. Radiography of the lumbar spine in primary care patients with low back pain: randomised controlled trial. BMJ 2001;322:400-405.
112.    Kilpikoski S, Airaksinen O, Kankaanpaa M, Leminen P, Videman T, Alen M. Interexaminer reliability of low back pain assessment using the McKenzie method. Spine 2002;27:E207-E214.
113.    Klaber Moffet J, Torgerson D, Bell-Syer S, Jackson D, Llewwlyn Phillips H, et al. A randomized trial of exercise for primary care back pain patients: Clinical outcomes, costs and preferences. British Medical Journal 1999;319:279-283.
114.    Klapow JC, Slater MA, Patterson TL, Atkinson JH, Weickgenant AL, Grant I, Garfin SR: Psychosocial factors discriminate multidimensional clinical groups of chronic low back pain patients. Pain 1995;62:349-355.
115.    Klein AB, Snyder-Mackler L, Roy SH, et al. Comparision of spinal mobility and isometric trunk extensor forces with electromyographic spectral analysis in identifying low back pain. Phys Ther 1991;71 (6):445-454.
116.    Komori H, Shimoyama K, Nakai O, et al. The natural history of herniated nucleus pulposus with radiculopathy. Spine 1996; 21: 225–9.   
117.    Laboeuf-Yde C. Manniche C. Low back pain: time to get off the treadmill. JMPT 2001;24:63-65.
118.    Laboeuf-Yde C., Lauritsen JM, Lauritzen T. Why has the search for
causes of low back pain largely been nonconclusive? Spine 1997;22:877-881.
119.    Lackner JM, Carosella AM, Feuerstein M. Pain expectancies, pain, and functional self-efficacy expectancies as determinants of disability in patients with chronic low back disorders.  J Consulting and Clin Psych 1996;64:212-220
120.    Lackner JM, Carosella AM. The relative influence of perceived pain control, anxiety, and functional self-efficacy on spinal function among patients with chronic low back pain. Spine 1999;24:2254-2261.
121.    Lamoth CJC, Meijer OG, Wuisman PIJM, van Dieën J H, Levin MF, Beek PJ. Pelvis-thorax coordination in the transverse plane during walking in persons with nonspecific low back pain. Spine 2002;27:E92-E99.
122.    LaRocca H. A taxonomy of chronic pain syndromes. 1991 Presidential Address. Cervical Spine Research Society Annual Meeting. December 5, 1991. Spine 1992;10: S344.
123.    Larsen K, Weidick F, Leboeuf-Yde C. Can passive prone extensions of the back prevent back problems?: A randomized, controlled trial of 314 military conscripts. Spine 2002;27:2747-2752.
124.    Latimer J, Maher CG, Refshauge K, Colaco I. The reliability and validity of the Biering-Sorensen test in asymptomatic subjection and subjects reporting current or previous non-specific low back pain. Spine 1999;24:2085-2090.
125.    Lehto M, Jarvinen M, Nelimarkka O. Scar formation after skeletal muscle injury. Arch Orthop Trauma Surg 1986; 104:366-370.
126.    Leinonen V, Kankaanpää M, Luukkonen  M, Hänninen O, Airaksinen O, Taimela S. Disc herniation-related back pain impairs feed-forward control of paraspinal muscles. Spine 2001;26:E367-E372.
127.    Leinonen V, Määttä S, Taimela S, Herno A, Kankaanpää M, Partanen J, Kansanen M, et al. Impaired lumbar movement perception in association with postural stability and motor- and somatosensory-evoked potentials in lumbar pinal stenosis  Spine 2002 May 1;27(9):975-983.
128.    Lindstrom A, Ohlund C, Eek C, et al. Activation of subacute low back patients. Physical Therapy 1992;4:279--293.
129.    Linton SL, Hellsing AL, Andersson D. A controlled study of the effects of an early active intervention on acute musculoskeletal pain problems. Pain 1993;54:353-359.
130.    Linton SJ, van Tulder MW.† Preventive interventions for back and neck pain problems. What is the evidence? Spine 2001;26:778-787.
131.    Linton SJ, Hellsing AL, Bergström G. Exercise for workers with musculoskeletal pain: Does enhancing compliance decrease pain? J Occup Rehabil 1996; 6: 177–90.   
132.    Linton SJ. The socioeconomic impact of chronic back pain: is anyone benefiting? Editorial. Pain 1998;75:163-168.
133.    Linton, S. J., Buer, N., Vlaeyen, J., & Hellsing, A. L. . Are fear-avoidance beliefs related to a new episode of back pain? A prospective study. Psychology and Health, 2000;14, 1051-1059.
134.    Linton SJ, Andersson T. Can chronic disability be prevented? A randomized trial of a cognitive-behavioral intervention for spinal pain patients. Spine 2000;25:2825–31.   
135.    Linton SJ. Cognitive-behavioral therapy in the prevention of musculoskeletal pain: description of a program. In Linton  SL (ed) New avenues for the prevention of chronic musculoskeletal pain and disability. Elsevier, Amsterdam, 2002.
136.    Linton SJ, Ryberg M. A cognitive-behavioral group intervention as prevention for persistent neck and back pain in a non-patient population: a randomized controlled trial. Pain 2001; 90:83-90.
137.    Little P, Roberts L, Blowers H, Garwood J, Cantrell T, Langridge J, Chapman J. Should we give detailed advice and information booklets to patients with back pain? A randomized controlled factorial trial of a self-management booklet and doctor advice to take exercise for back pain. Spine 2001;26:2065-2072.
138.    Loisel P, Abenhaim L,  Durand P, Esdaile JM, Suissa S, Gosselin L, Simard R , Turcotte J, Lemaire J. A population-based, randomized clinical trial on back pain management. Spine 1997; 22: 2911-2918.
139.    Loisel P, Gosselin L, Durand P, Lemaire J, Poitras S, Abenhaim L. Implementation of a participatory ergonomics program in the rehabilitation  of workers suffering from subacute back pain. Appl Ergon. 2001 Feb;32(1):53-60.
140.    Long A, Donelson R, Fung T.  Does it matter which exercise? Spine 2004;29:2593-2602.
141.    Loudon JK, Ruhl M, Field E. Ability to reproduce head position after whiplash injury. Spine 1997;22:865-868.
142.    Luoto S, Heliovaara M, Hurri H, Alaranta H. Static back endurance and the risk of low-back pain. Clin Biomech 1995;10:323-324.
143.    Luoto S, Taimela S, Hurri H, et al. Mechanisms explaining the association between low back trouble and deficits in information processing. A controlled study with follow-up. Spine 1999; 24 (3): 255-61.
144.    Luoto S, Taimela S, Hurri H, et al. Psychomotor speed and postural control in chronic low-back pain patients: A controlled follow-up study. Spine 1996; 21: 2621-7.
145.    Luoto S, Aalto H, Taimela S, et al. One-footed and externally disturbed two-footed postural control in chronic low-back pain patients and healthy controls: A controlled study with follow-up. Spine 1998; 23: 2081-90.
146.    Macfarlane GJ, Thomas E, Croft PR, Papageorgiou AC, Jayson MIV, Silman AJ: Predictors of early improvement in low back pain amongst consulters to general practice: The influence of pre-morbid and episode-related factors. Pain 1999;80:113-119.
147.    Main CJ, Watson PJ. Psychological aspects of pain. Manual Therapy 1999;4:203-215.
148.    Malmivaara A, Hakkinen U, Aro T, et al. The treatment of acute low back pain - bed rest, exercises, or ordinary activity? N Engl J Med 1995; 332:351-5.
149.    Maluf KS, Sahrmann SA, Van Dillen LR: Use of a classification system to guide non-surgical treatment of a patient with chronic low back pain.  Physical Therapy 2000;80:1097-1111, 2000.
150.    Manniche C, Lundberg E, Christensen I, Bentzen L, Hesselesoe G.et al. Intensive dynamic back exercises for chronic low back pain. Pain 1991;47:53-63.
151.    Manniche C, Jordan A. Letter to the editor. Spine 2001;26:840-844.
152.    Mannion AF, Junge A, Taimela S, Muntener M, Lorenzo K, Dvorak J. Active therapy for chronic low back pain. Part 3. Factors influencing self-rated disability and its change following therapy. Spine 2001;26:920-929.
153.    Mannion AF, Taimela S, Muntener M, Dvorak J. Active therapy for chronic low back pain. Part 1. Effects on back muscle activation, fatigability, and strength. Spine 2001;26:897-908.
154.    Mannion AF, Muntener M, Taimela S, et al. A randomized clinical trial of three active therapies for chronic low back pain [In Process Citation]. Spine 1999; 24: 2435–48.   
155.    Mannion AF et al. Changes in pain and disability one year after active therapy for chronic low back pain. Inter Soc Study of Lumbar Spine, Adelaide, Australia 2000.
156.    Marras WS, Ferguson SA, Gupta P, et al . The quantification of low back disorder using motin measures. Methodology and validation. Spine 1999;24(20):2091-100.
157.    Matheson LM,  Gaudino WA, Mael F, Hesse BW. Improving the validity of the impairment evaluation process: A proposed theoretical framework. J Occupational Rehabilitation. 2000;10:311-320.
158.    Mayer TG, Smith S, Keeley J, Mooney V. Quantification of lumbar function part 2: sagittal plane trunk strength in chronic low back patients. Spine 1985;10:765-772.
159.    Mayer TG, Kondraske G, Mooney V, et al. Lumbar myoelectric spectral analysis for endurance assessment. A comparison of normals with deconditioned patients. Spine 1989; 14 (9): 986-91.
160.    Mayer TG, Gatchel R, Betancur J, Bovasso E. Trunk muscle endurance measurement: Isometric contrasted to isokinetic testing in normal subjects. Spine 1995;20:920-7.
161.    Mayer TG, Gatchel RJ, Mayer H, et al: A prospective two-year study of functional restoration in industrial low back injury. JAMA, 1987;258:1763-1767.
162.    McGill SM. ISB Keynote Lecture The biomechanics of low back injury: Implications on current practice in industry and the clinic, J Biomech 1997; 30: 465 475.
163.    McGill SM. Study in progress
164.    McGregor AH, McCarthy ID, Dore CJ, et al. Quantitative assessment of the motion of the lumbar spine in the low back pain population and the effect of different spinal pathologies of this motion. Eur Spine J 1997;6(5):308-15.
165.    McIntosh G, Frank J, Hogg-Johnson S, Bombardier C, Hall H. Prognostic factors for time receiving workers' compensation benefits in a cohort of patients with low back pain. Spine 2000; 25:147-157.
166.    McKinney LA. Early mobilisation and outcome in acute sprains of the neck. BMJ 1989;299:1006-8.
167.    McPartland JM, Brodeur RR, Hallgren RC: Chronic neck pain, standing balance and suboccipital muscle atrophy: A pilot study. J Manipulative Physiol Ther 1997;20:24-29.
168.    Mellin G. Chronic low back pain in men 54-63 years of age. Correlations of physical measurements with the degree of trouble and progress after treatment. Spine 1986;11(5):421-6.
169.    Mens JM, Vleeming A, Snijders CJ, et al. The active straight-leg-raising test and mobility of the pelvic joints. Eur Spine J 1999; 8: 468–74.   
170.    Mens JMA, Vleeming A, Snijders CJ, et al. Active straight-leg-raise test: A clinical approach to the load transfer function of the pelvic girdle. In: Vleeming A, Mooney V, Dorman T, et al., eds. Movement, Stability and Low Back Pain: The Essential Role of the Pelvis. Edinburgh: Churchill Livingstone, 1997:425–31.   
171.    Mense  S. Simons DG. Muscle Pain  Understanding Its Nature, Diagnosis, and Treatment. Chapter 5 Pain associated with increased muscle tension 99-130. Lippincott, Williams & Wilkins, Baltimore, 2001.
172.    Mochida K, Komori H, Okawa A, et al. Regression of cervical disc herniation observed on magnetic resonance images. Spine 1998; 23: 990–7.   
173.    Moore JE, Von Korff M, Cherkin D,et al. A randomized trial of a cognitive-behavioral program for enhancing back pain self-care in a primary care setting.Pain 2000;88:145–53.   
174.    Moffroid MT, Haugh LD, Haig AJ, Pope M. Endurance training of trunk extensor muscles. Phys Ther 1993; 73: 10-7.
175.    Moffroid MT, Reid S, Henry S,Haugh LD, Ricamato A. Some endurance measures in persons with chronic low back pain. Journal Orthopaedic Sport’s Physical Therapy 1994;20:81-7.
176.    Mok NW, Brauer S, Hodges PW. Hip strategy for balance control in quiet standing is reduced in people with low back pain. Spine 2004;29:E107-E112.
177.    Mold JW, Stein HF. The cascade effect in the clinical care of patients. New Eng J Med 1986;314:512-514.
178.    Moore JE, Von Korff M, Cherkin D, Saunders K, Lorig K. A randomized trial of a cognitive-behavioral program for enhancing back pain self-care in a primary care setting. Pain 2000;88:145-153.
179.    Muller EA. Influence of training and of inactivity on muscle strength. Arch Phys Med Rehabil 1970;51:449-62.
180.    Nattrass CL, Nitschke JE, Disler PB, et al. Lumbar spine range of motion as a measure of physical and functional impairment: an investigation of validity. Clin Rehabil 1999;13(3):211-8.
181.    Nederhand MJ, Ijzerman MJ, Hermens HK, Baten CTM, Zilvold G. Cervical muscle dysfunction in the chronic whiplash associated disorder Grade II(WAD-II). Spine 2000;15;1938-1943.
182.    Newcomer KL, Laskowski ER. Yu B, Johnson JC, An KN. Differences in repositioning error among patients with low back pain compared with control subjects. Spine 2000;25:2488-2493.
183.    Newton M, Thow M, Somerville D, et al. Trunk strength testing with iso-machines: Part 2: Experimental evaluation of the Cybex II Back Testing System in normal subjects and patients with chronic low back pain. Spine 1993; 18 (7): 812–24.   
184.    Nicolaisen T, Joregnesen K. Trunk strength, back muscle endurance and low back trouble. Scand J Rehabil Med 1985;17:121-7.
185.    Nitschke JE, Nattrass CL, Disler PB, et al. Reliability of the American Medical Association Guide’s model for measuring spinal range of motion. Spine 1999;24(3):262-8.
186.    Novy DM, Simmonds MJ, Olson SL,Lee E, Jones SC. Physical performance: Differences in men and women with and without low back pain. Arch Phys Med Rehabil 1999;80:195-198.
187.    Novy DM, Simmonds MJ, Lee E. Physical performance tasks: What are the underlying constructs? Arch Phys Med Rehabil 2002;83:44-47.
188.    Noyes F: Functional properties of knee ligaments and alterations induced by immobilization. Clin Orthop 1977;123:210-242.
189.    O’Reilly SC, Muir KR, Doherty M. Effectiveness of home exercise on pain and disability from osteoarthritis of the knee: a randomised controlled trial. Ann Rheum Dis 1999;58:15-19.
190.    O’Sullivan P, Twomey L, Allison G.  Evaluation of specific stabilizing exercise in the treatment of chronic low back pain with radiologic diagnosis of spondylolysis or spondylolysthesis. Spine 1997;24:2959-2967
191.    O’Sullivan P, Twomey L, Allison G, et al. Altered patterns of abdominal muscle activation in patients with chronic low back pain.  Aust J Physio 1997;43:91-98.
192.    O’Sullivan PB, Beales DJ, Beetham JA, Cripps J, Graf F, Lin IB, Tucker B, Avery A. Altered motor control strategies in subjects with sacroiliac joint pain during the active straight-leg-raise test.  Spine 2002;27:E1-E8
193.    Paarnianpour M, Nordin M, Kahanovitz N, Frank V. The triaxial coupling of torque generation of trunk muscles during  isometric exertions and the effect of fatiguing isoinertial movements on the motor output and movement patterns. Spine 1998;13:982-992.
194.    Parks KA, Crichton KS, Goldford RF, McGill SM. A comparison of lumbar range of motion and functional ability scores in patients with low back pain. Spine 2003;28:380-384.
195.    Pate R, Pratt M, Blair Sn, haskell Wl, Macera CA, Bouchard C, et al. Physical activity and public health. A recommendation from the Centers for Disease Control and Prevention and the American College of Sports Medicine. JAMA 1995;273:402-7.
196.    Pengel LHM, Refshauge KM, Maher CG. Responsiveness of pain, disability, and physical impairment outcomes in patients with low back pain. Spine 2004;29:879-883.
197.    Pfingstein M, Kroner-Herwig B, Harter W, et al. Fear-avoidance behavior and anticipation of pain in patients with chronic low back pain–a randomized controlled study. Spine, in press
198.    Peach JP, McGill SM. Classification of low back pain with the use of spectral electromyogram parameters. Spine 1998; 23: 1117-23.
199.    Petersen T, Kryger P, Ekdahl C, Olsen S, Jacobsen S. The effect of McKenzie Therapy as Compared with that of intensive strengthening training for the treatment of patients with subacute or chronic low back pain: A randomized clinical trial. Spine 2002;27:1702-1709.
200.    Physical Activity and Health: A Report of the Surgeon General. Atlanta, GA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion; 1996.
201.    Physical activity and cardiovascular health. NIH Consensus Development Panel on Physical Activity and Cardiovascular Health. JAMA. 1996;276:241-6.
202.     Pincus T, Burton AK, Vogel S, Field AP.A systematic review of psychological factors as predictors of chronicity/disability in prospective cohorts of low back pain. Spine 2000;27:E109-E120.
203.    Postacchini F. Management of herniation of the lumbar disc. J Bone Joint Surg [Br] 1999; 81: 567–76.   
204.    Radebold A, Cholewicki J, Panjabi MM, Patel TC. Muscle response pattern to sudden trunk loading in healthy individuals and in patients with chronic low back pain. Spine 2000;25:947-954.
205.    Radebold A, Cholewicki J, Polzhofer BA, Greene HS. Impaired postural control of the lumbar spine is associated with delayed muscle response times in patients with chronic idiopathic low back pain. Spine 2001;26:724-730.
206.    Razmjou H, Kramer JF, Yamada R. Intertester reliability of the McKenzie evaluation in assessing patients with mechanical low back pain.J Orthop Sports Phys Ther 2000;30:368–83.   
207.    Reis S, Hermoni D, Borkan J, et al. The RAMBAM–Israeli Sentinel Practice Network The LBP PATIENT PERCEPTION SCALE. A new predictor of chronicity and other episode outcomes among primary care patients. (In Preparation).   
208.    Revel M, Minguet M, Gergoy P, Vaillant J, Manuel JL. Changes in cervicocephalic kinesthesia after a proprioceptive rehabilitation program in neck pain: A randomized controlled study. Arch Phys Med Rehabil 1994;75:895-899.
209.    Richardson CA, Snijders CJ, Hides JA, Damen L, Pas MS, Storm J. The relation between the transversus abdominis muscles, sacroiliac joint mechanics, and low back pain. Spine 2002;27:399-405.
210.    Riddle DL, Rothstein JM. Intertester reliability of McKenzie’s classifications of the syndrome types present in patients with low back pain.Spine 1993;18:1333–44.   
211.    Rissanaen A, Alaranta H, Sainio P, et al. Isokinetic and non-dynamometric tests in low back pain patients related to pain and disability index. Spine 1994;19(17):1963-7.
212.    Roland M, Waddell G, Moffett JK, Burton K, Main C, Cantrell T. The Back Book.  The Stationary Office, London 1996.
213.    Rosenfeld M, Gunnarsson R, Borenstein P. Early intervention in whiplash-associated disorders: A comparison of two treatment protocols. Spine 2000;25(14):1782-1787.
214.    Roy SH, De Luca CJ, Casavant DA. Lumbar muscle fatigue and chronic lower back pain. Spine 1989; 14: 992-1001.
215.    Roy SH, DeLuca CJ, Emley M, et al. Spectral electromyographic assessment of back muscles in patients with low back pain undergoing rehabilitation. Spine 1995; 20: 38-48.
216.    Roy SH, DeLuca CJ, Snyder-Mackler L, et al. Fatigue, recovery and low back pain in varsity rowers. Med Sci Sports Exerc 1990; 22: 463-9.
217.    Royal College of General Practitioners (RCGP). Clinical Guidelines for the Management of Acute Low Back Pain.  London, Royal College of General Practitioners (www.rcgp.org.uk), 1999.
218.    Salter R, Simmonds DR, Malcolm BW, et al. The biological effect of continuous passive motion on the healing of full-thickness defects in articular cartilage. 1980;62A:1232-1251.
219.    Shaw WS, Feuerstein M, Haufler AJ, Berkowitz SM, Lopez MS. Working with low back pain: problem-solving orientation and function. Pain 2001;93:129-137.
220.    Shirado O, Ito T, Kaneda K, et al. Flexion-relaxation phenomenon in the back muscles: A comparative study between healthy subjects and patients with chronic low back pain. Am J Phys Med Rehabili 1995;74:139-144.
221.    Silverman JL, Rodriguez AA, Agre JC. Quantitative cervical flexor strength in healthy subjects and in subjects with mechanical neck pain. Arch Phys Med Rehabil 1991;72:679-81.
222.    Simmonds MJ, Olson SL, Jones S, Hussein T, Lee CE, et al. Psychometric characteristics and clinical usefullness of physical performance tests in patients with low back pain. Spine 1998; 23(22):2412-2421.
223.    Sjolie AN. Active or passive journeys and low back pain in adolescents. Eur Spine J. 2003;12:581-588.
224.    Skouen JS, Grasdal AL, Haldorsen EMH, Ursin H. Relative cost-effectiveness of extensive and light multidisciplinary treatment programs versus treatment as usual for patients with chronic low back pain on long-term sick leave: randomized controlled study. Spine 2002 ;27(9):901-909
225.    Snook SH, Webster BS, McGorry RW, Fogleman MT, McCann KB, The reduction of chronic nonspecific low back pain through the control of early morning lumbar flexion, Spine 1998; 23: 2601-2607.
226.    Snook SH, Webster BS, McGorry RW. The reduction of chronic, nonspecific low back pain through the control of early morning lumbar flexion:3 – year follow-up. J Occupational Rehabilitation 2002;12:13-20.
227.    Spitzer WO, Skovron ML, Salmi LIR, et al. Scientific monograph of the Quebec Task Force on Whiplash-Associated Disorders: Redefining “Whiplash” and its management. Spine 1995;20(Supp):S1-73.
228.    Stankovic R, Johnell O. Conservative treatment of acute low-back pain. A prospective randomized trial. McKenzie method of treatment versus patient education in “mini back school.” Spine 1990;15:120-3.
229.    Stenstrom CH, Sandberg A. Home exercise and compliance in inflammatory rheumatic diseases – a prospective clinical trial. The Journal of Rheumatology 1997;24(2):470-476.
230.    Sterling M, Jull G, Vicenzino B, Kenardy J, Darnell R. Development of motor system dysfunction following whiplash injury. Pain 2003;103:65-73.
231.    Stevenson JM, Weber CL, Smith JT, Dumas GA, Albert WJ. A longitudinal study of the development of low back pain in an industrial population. Spine 2001;26:1370-1377.
232.    Swinkels-Meewisse IEJ, Roelofs J, Verbeek ALM, Oostendorp RAB, Vlaeyen JWS. Fear of movement/(re)injury, disability and participation in acute low back pain. Pain. 2003;105:371-379.
233.    Symonds TL, Burton AK, Tillotson KM, et al. Absence resulting from low back trouble can be reduced by psychosocial intervention at the work place. Spine 1995; 20: 2738–45.  
234.    Taimela S, Diederich C, Hubsch M, Heinricy M. The role of physical exercise and inactivity in pain recurrence and absenteeism from work after active outpatient rehabilitation for recurrent or chronic low back pain. A follow up study. Spine 2000;25:1809-1816.
235.    Taimela S, Kankaanpää M, Luoto S. The effect of lumbar fatigue on the ability to sense a change in lumbar position. A controlled study. Spine 1999; 24 (13): 1322-7.
236.    Taimela S, Österman K, Alaranta H, et al. Long psychomotor reaction time in patients with chronic low-back pain - preliminary report. Arch Phys Med Rehab 1993; 74: 1161-4.
237.    Takala EP, Viikari-Juntura E, Tynkkynen EM. Does group gymnastics at the workplace help in neck pain? A controlled study. Scand J Rehabil Med 1994; 26: 17–20.   
238.    Takala EP, Vikari-Juntura E. Do functional tests predict low back pain. Spine 2000;25(16):2126-2132.
239.    Teresi LM, Lufkin RB, Reicher MA, et al. Asymptomatic degenerative disk disease and spondylosis of the cervical spine: MR Imaging. Radiology. 1987;164:83-88.
240.    Thomas E, Silman AJ, Croft PR, Papageorgiou AC, Jayson MIV, Macfarlane GJ. Predicting who develops chronic low back pain in primary care: a prospective study. BMJ 1999;318:1662-7.
241.    Thompson DA, Biedermann H-J, Stevenson JM, et al. Changes in paraspinal electromyographic spectral analysis with exercise: two studies. J EMG Kinesiol 1992; 2 (3): 179-86.
242.    Timm KE. A randomized-control study of active and passive treatments for chronic low back pain following L5 laminectomy. JOSPT 1994; 20:276-286.
243.    Treleavan J, Jull G, Atkinson L. Cervical musculoskeletal dysfunction in post-concussion headache. Cephalalgia 1994; 14:273-279.
244.    Treleaven J, Jull G, Sterling M. Dizziness and unsteadiness following whiplash injury: characteristic features and relationship with cervical joint position error. J Rehabil Med 2003;35:36-43.
245.    Triano JJ, Schultz AB. Correlation of objective measure of turnk motion and muscle functiona with lo-back disability ratings. Spine 1987;12:561-5.
246.    Turner JA, Franklin G, Haegerty PJ, Wu R, Egan K, et al. The association between pain and disability. Pain 2004;112:307-314.
247.    UK BEAM Trial Team. United Kingdom back pain exercise and manipulation (UK BEAM) randomized trial: effectiveness of physical treatments for back pain in primary care. BMJ 2004;doi:10.1136/bmj.38282.669225.AE.
248.    UK BEAM Trial Team. United Kingdom back pain exercise and manipulation (UK BEAM) randomized trial: cost effectiveness of physical treatments for back pain in primary care. BMJ 2004;doi:10.1136/bmj.38282.607859.AE.

249.    van den Hout JHC, Vlaeyen JWS, Houben RMA, Soeters APM, Peters ML. The effects of failure feedback and pain-related fear on pain report, pain tolerance, and pain avoidance in chronic low back pain patients. Pain 2001;92:247-257.
250.    Van den Hout JHC.  Vlaeyen JWS. Problem-solving therapy and behavioral graded activity in the prevention of chronic pain disability. In Linton  SL (ed) New avenues for the prevention of chronic musculoskeletal pain and disability. Elsevier, Amsterdam, 2002.
251.    Van  Dillen  LR, Sahrmann SA, Norton BJ, McDonnell MK, Fleming DA,
Caldwell CA, Woolsey NB: The effect of active limb movements on symptoms in
patients with  low  back  pain.  Journal  of Orthopedic and Sports Physical
Therapy 2001;31:402-413,2001.
252.    Van Dillen LR, McDonnell MK, Fleming DA, Sahrmann SA: The effect
of hip and knee position on hip extension range of motion measures in
individuals with and  without  low  back  pain.   Journal  of Orthopedic and
Sports Physical Therapy 2000;30:307-316,2000.
253.    Van  Dillen  LR, Sahrmann SA, Norton BJ, Caldwell CA, Fleming DA,
McDonnell MK, Woolsey NB: Reliability of physical examination items used for
classification of patients with low back pain. Physical Therapy
1998;78:979-988.
254.    Van  Dillen  LR, Sahrmann SA, Norton BJ, Caldwell CA, McDonnell MK, Bloom NJ. Movement system impairment-based categories for low back pain: Stage 1 validation. J Orthop Sports Phys Ther 2003;33:126-142.
255.    van Tulder MW, Assendelft JJ, Koes BW, Bouter LM. Spinal radiographic findings and nonspecific low back pain: a systematic review of observational studies. Spine 1997; 22: 427-434.
256.    Van Tulder MW, Koes BW, Bouter LM. Conservative treatment of acute and chronic nonspecific low back pain: A systematic review of randomized controlled trials of the most common interventions. Spine 1997a;22(18):2128-2156.
257.    Van Tulder MW. Malmivaara A, Esmail R, Koes B. Exercise therapy for low back pain. A systematic review within the framework of the Cochrane Collaboration Back Review Group. Spine 2000;25(21):2784-2796.
258.    Vlaeyen JWS, Crombez G. Fear of movement/(re)injury, avoidance and pain disability in chronic low back pain patients. Manual Therapy 1999:4:187-195
259.    Vlaeyen JWS, Linton S. Fear-avoidance and its consequences in chronic musculoskeletal pain. A state of the art. Pain 2000;85:317-332.
260.    Vlaeyen JWS, De Jong J, Geilen M, Heuts PHTG, Van Breukelen G. Graded exposure in the treatment of pain-related fear: a replicated single case experimental design in four patients with chronic low back pain. Behav Res Ther 2001;39:151-166.
261.    Vlaeyen JWS, Morley S. Active despite pain: the putative role of stop-rules and current mood. Pain 2004;110:512-516.
262.    Von Korff M, Moore JE, Lorig K,et al. A randomized trial of a lay-led self-management group intervention for back pain patients in primary care. Spine 1998;23:2608–15.   
263.    Von Korff, J. Ormel, F.J. Keefe and S.F. Dworkin, Grading the severity of chronic pain. Pain 1992;50:133–149.
264.    Vroomen PCAJ, de Krom MCTFM, Wilmink JT, Kester ADM, Knottnerus JA. Lack of effectiveness of bed rest for sciatica. The New England Journal of Medicine 1999; 340: 418-423.
265.    Waddell G, Somerville D, Henderson I, et al. Objective clinical evaluation of physical impairment in chronic low back pain. Spine 1992;17:617-28.
266.    Waddell G. The Back Pain Revolution.  Edinburgh, Churchill Livingstone, 1998.
267.    Watson P, Booker CK, Main CJ,et al.Surface electromyography in the identification of chronic low back pain patients:the development of the flexion relaxation ratio.Clinical Biomechanics 1997;12:165–71.   
268.    Watson, DH, Trott PH. Cervical Headache: an investigation of natural head posture and cervical flexor muscle performance. Cephalgia 1993:13;272-284.
269.    Wennberg DE, Kellet MA, Dickens JD, Malenka DJ, Keilson LM, Keller RB. The association between local diagnostic testing intensity and invasive cardiac procedures. JAMA 1996;275:1161-1164.
270.    Werneke M, Hart DL. Discriminant validity and relative precision for classifying patients with nonspecific neck and back pain by anatomic pain patterns. Spine 2003;28:161-166.
271.    Wiesel SE, Tsourmans N, Feffer HL, et al: A study of computer-assisted tomography. I. The incidence of positive CAT scans in an asymptomatic group of patients. Spine 1984;9:549.
272.    Wilder DG, Aleksiev AR, Magnusson ML, Pope MH, Spratt KF, Goel VK. Muscular response to sudden load. A tool to evaluate fatigue and rehabilitation. Spine 1996;21:2628–39.
273.    Wilson L, Hall H, McIntosh G, Melles T. Intertester reliability of a low back pain classification system. Spine 1999;24:248-254.
274.    Wood KA, Standell CJ, Adams MA, et al. Exercise training to improve spinal mobility and back muscle fatigability: A possible prophylaxis for low back pain? Physical Medicine Research Foundation Symposium: Clinical Approaches to Spinal Disorders. Prague, 1997.
275.    World Health Organization. International Classification of Human Functioning, Disability and Health: ICF. Geneva : WHO 2001.
276.    Yordi GA, Lent RW. Predicting aerobic exercise participation: social, cognitive, reasoned action, and planned behavioral models. J Sports Exercise Psychol 1993;15:363-74.
277.    Yoshihara K, Shirai Y, Nakayama Y, Uesaka S. Histochemical changes in the multifidus muscle in patients with lumbar intervertebral disc herniation Spine 2001;26:622-626.
278.    Zhao WP, Kawaguchi Y, Matsui H, Kanamori M, Kimura T. Histochemistry and morphology of the multifidus muscle in lumbar disc herniation. Comparative study between diseased and normal sides. Spine 2000;25:2191-2199.
279.    Zuberbier OA, Hunt DG, Kozlowski AJ, Berkowitz J, Schultz IZ, Crook JM, Milner RA. Commentary on the American Medical Association Guides’ lumbar impairment validity checks. Spine 2001;26:2735-2737