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Jaime Guzmán a Institute for
Work and Health, Toronto, Canada M4W 1E6, b Finnish Institute of Occupational Health, Helsinki,
Finland 00250
Correspondence to: J Guzmán, University of Manitoba Faculty
of Medicine, S112-750 Bannatyne Avenue, Winnipeg MB, Canada R3E 0W3
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Abstract |
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Objective:
To assess the effect of
multidisciplinary biopsychosocial rehabilitation on clinically relevant
outcomes in patients with chronic low back pain.
Design:
Systematic literature review of
randomised controlled trials.
Participants:
A total of 1964 patients with disabling
low back pain for more than three months.
Main outcome measures:
Pain, function,
employment, quality of life, and global assessments.
Results:
Ten trials reported on a total of 12 randomised comparisons of multidisciplinary treatment and a control
condition. There was strong evidence that intensive multidisciplinary
biopsychosocial rehabilitation with functional restoration improves
function when compared with inpatient or outpatient
non-multidisciplinary treatments. There was moderate evidence that
intensive multidisciplinary biopsychosocial rehabilitation with
functional restoration reduces pain when compared with outpatient
non-multidisciplinary rehabilitation or usual care. There was
contradictory evidence regarding vocational outcomes of intensive
multidisciplinary biopsychosocial intervention. Some trials reported
improvements in work readiness, but others showed no significant
reduction in sickness leaves. Less intensive outpatient psychophysical
treatments did not improve pain, function, or vocational outcomes when
compared with non-multidisciplinary outpatient therapy or usual care.
Few trials reported effects on quality of life or global assessments.
Conclusions:
The reviewed trials provide evidence
that intensive multidisciplinary biopsychosocial rehabilitation with functional restoration reduces pain and improves function in patients with chronic low back pain. Less intensive interventions did not show
improvements in clinically relevant outcomes.
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What is already known on this topic
What this study adds
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Introduction |
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In many countries chronic low back pain is the most common cause of long term disability in middle age.1 Chronic low back pain is resistant to treatment, and patients are often referred for multidisciplinary treatment.2 Current multidisciplinary biopsychosocial rehabilitation regards disabling chronic pain as the result of multiple interrelating physical, psychological, and social or occupational factors. 3 4
Multidisciplinary treatments for chronic pain have been evaluated
in many non-randomised studies and non-systematic reviews; both are
prone to bias.5 We are aware of two published systematic reviews on this topic. Flor et al reviewed 65 controlled and
non-controlled studies available in 1990.6 They calculated
overall effect sizes within and between groups. They concluded that
multidisciplinary treatments were effective, although the
methodological quality of the studies was marginal. Cutler et al
combined studies of multidisciplinary treatments and of other
non-surgical treatments
a total of 37 controlled and non-controlled
studies.7 They concluded that non-surgical treatment of
chronic pain does enable patients to return to work. Estimating
treatment effects in the absence of a control group and pooling
together controlled and non-controlled studies implies a high risk of
bias. Furthermore, these systematic reviews included no randomised
controlled trials.
We aimed to assess systematically, based on available randomised
controlled trials, the effect of multidisciplinary biopsychosocial rehabilitation on clinically relevant outcomes in patients with chronic
low back pain.
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Methods |
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The study was conducted under the sponsorship of the Back Review Group of the Cochrane Collaboration. It adhered to the methodological guidelines approved by the group.8 A detailed protocol was peer reviewed and published before data were collected.9
Selection of studies for review
To be included, a study had to fulfil several criteria.
Participants had to be adults with disabling low back pain for more
than three months (with or without sciatica). One group of participants
had to have received multidisciplinary biopsychosocial rehabilitation;
a minimum of the physical dimension and one of the other dimensions
(psychological or social or occupational) had to be present as defined
in the protocol.9 One group of participants had to have
received a control treatment that did not fulfil our criteria for
multidisciplinary rehabilitation. The study had to report treatment
effect in at least one of these variables: pain severity, global
improvement, functional status, quality of life, and employment status.
Interventions described as back schools were excluded, unless they were
part of a programme that fulfilled our criteria for multidisciplinary
biopsychosocial rehabilitation.
Identification and assessment of trials
We used three strategies to locate candidate randomised
controlled trials: an electronic database search (using Medline,
Embase, PsycLIT, CINAHL, Health Star, and the Cochrane Library from the
beginning of each database to June 1998 with no language
restrictions), citation tracking, and consultation with content experts.
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Data analysis
We calculated treatment effect sizes between groups and 95%
confidence intervals for each randomised comparison for each outcome
and follow up time. We calculated relative risks for dichotomous
outcomes10 and standardised mean differences for
continuous outcomes. If necessary, we approximated the numbers required
for calculations from graphs and statistics in the article. When the
standard deviation at follow up was not available, we used the standard
deviation at baseline. If none was reported, we assumed the average
standard deviation reported by other studies for that outcome. All
analyses were conducted using Meta-View Rev-Man software version 3.1.1 (Cochrane Collaboration, 1998).
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Results |
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Our search identified 32 candidate randomised controlled trials. Twenty one failed to fulfil the criteria for review. One other trial did not allow the estimation of treatment effect for any outcome.14 Thus 10 studies were included in this review. The trials were performed in Scandinavian countries,15-24 Germany, 25 26 Australia, 27 28 and Canada. 29 30 A list of excluded studies is available from the authors.
Table 1 lists the participants, interventions, and outcome measures of the trials. The trials included a total of 1964 people with low back pain. All trials excluded patients with significant radiculopathy or other indication for surgery. Most participants were workers selected from insurance listings 15 21 29 or patients referred to pain centres. 16-18 25-28 Two trials randomised patients into three groups: one control group and two treatment programmes that fulfilled our definition of multidisciplinary rehabilitation. 17 21 One trial randomised patients into six small groups in a block design.27 For this review, the four multidisciplinary rehabilitation groups are compared with the two non-multidisciplinary rehabilitation groups. Thus, the 10 trials report on 12 randomised comparisons of multidisciplinary rehabilitation and a control condition. Follow up varied from immediately after treatment, 25 26 to up to five years after treatment. 17 18
Table 2 summarises the methodological quality and clinical relevance of the trials. Most trials measured relevant outcomes and had an acceptable dropout rate and comparable timing of assessment. Four described adequate concealment of allocation. 16 27-29 None of the trials accomplished blinding of patient or care provider. Overall, the methodological quality score varied from 2 to 6 points. The Scandinavian trials were judged more clinically relevant than the others.
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What kinds of multidisciplinary treatments have been tested?
Multidisciplinary biopsychosocial rehabilitation varied in setting
(inpatient or outpatient) and the time and intensity of the three
components (physical, psychological, and social or occupational).
Programmes fell into two main categories: daily intensive programmes
with more than 100 hours of therapy
15 17 18 21 26 29
and once or twice weekly programmes with less than 30 hours of therapy.
17 21 25 27 28
Five treatment programmes
specifically described all three components
15-18 29
;
four of these were modelled on the functional restoration approach
first reported by Mayer et al.31
Are multidisciplinary treatments effective?
The figure depicts treatment effect sizes on pain, function,
employment status, and sickness leaves after different lengths of
follow up. According to the effect sizes and following the described
criteria for strength of evidence:
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Discussion |
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The human and financial costs of disabling low back
pain are staggering
an estimated 1.7% of the gross national product
of a developed country.32 Many different rehabilitation
programmes of unclear efficacy are currently in use.2 This
study provides a classification of multidisciplinary biopsychosocial
rehabilitation and reviews 10 randomised controlled trials of such
rehabilitation for chronic low back pain, which have not been included
in previous systematic reviews.
6 7
We were able to locate
these trials because we did not impose any language or date
restrictions and because our definition of multidisciplinary
rehabilitation relied on the content of the intervention rather than
its name (many trials did not use the term multidisciplinary
biopsychosocial rehabilitation). The studies reviewed show that
intensive multidisciplinary rehabilitation with a functional
restoration approach decreased pain and improved function. Less
intensive programmes were not better than control non-multidisciplinary treatments.
Study limitations
Our findings must be interpreted in the light of the shortcomings
of systematic reviews, in particular publication bias.33
Four other potential limitations need to be considered.
Should patients with chronic low back pain be referred for
multidisciplinary treatment?
Given the variability across multidisciplinary treatments,
it is inappropriate to refer patients for multidisciplinary biopsychosocial rehabilitation without knowing the actual content of
the programme. The reviewed trials provide evidence that intensive daily multidisciplinary rehabilitation with a functional restoration approach produces improvements in pain and function in patients with
chronic disabling low back pain. Less intensive treatments did not seem
to be effective.
Conclusion
The reviewed studies provide evidence that intensive (>100 hours
of therapy) multidisciplinary biopsychosocial rehabilitation with
functional restoration produces greater improvements in pain and
function for patients with disabling chronic low back pain than less
intensive multidisciplinary or non-multidisciplinary rehabilitation or
usual care. Whether the improvements are worth the expense of these
intensive programmes is open for discussion. The final judgment will
depend on societal resources, available alternatives, and the value
attached to the observed decreases in human suffering from back pain.
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Acknowledgments |
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Contributors: JG contributed to the conception, design, and writing of the study protocol, helped to select and assess trials, conducted the data analysis, and drafted and approved the final manuscript. RE contributed to the conception, design, and writing of the study protocol, helped to select and assess trials, and revised and approved the final manuscript. KK contributed to the design and writing of the study protocol, helped to select and assess trials, and revised and approved the final manuscript. AM contributed to the design of the study protocol, helped to select and assess trials, and revised and approved the final manuscript. EI contributed to the design of search strategies and writing of the study protocol, located and obtained trial reports, and revised and approved the final manuscript. CB contributed to the conception and design of the study protocol, assembled and supervised the research team, and revised and approved the final manuscript. All the authors will act as guarantors for the paper.
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Footnotes |
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Funding: JG received a research fellowship from the Institute for Work and Health, an independent, not-for-profit research organisation that receives support from the Ontario Workplace Safety and Insurance Board. KK's work was supported by a fellowship from the Finnish Office for Health Care Technology Assessment. RE is currently with the Calgary Regional Health Authority, Calgary, Canada.
Competing interests: None declared.
Tables detailing the content of
multidisciplinary rehabilitation programmes and the crude outcomes of
the trials are on the BMJ's website
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References |
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(Accepted 6 April 2001)
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