BMJ  2004;329:708 (25 September), doi:10.1136/bmj.38216.868808.7C (published 17 September 2004)

Paper

Randomised controlled trial of physiotherapy compared with advice for low back pain

¹ Division of Health in the Community, Warwick Medical School, University of Warwick, Warwick CV4 7AL, ² Health Services Research Unit, Department of Public Health, University of Oxford, ³ Nuffield Orthopaedic Centre NHS Trust, Oxford

Abstract

Objective To measure the effectiveness of routine physiotherapy compared with an assessment session and advice from a physiotherapist for patients with low back pain.

Design Pragmatic, multicentre, randomised controlled trial.

Setting Seven British NHS physiotherapy departments.

Participants 286 patients with low back pain of more than six weeks' duration.

Intervention Routine physiotherapy or advice on remaining active from a physiotherapist. Both groups received an advice book.

Main outcome measures Primary outcome was scores on the Oswestry disability index at 12 months. Secondary outcomes were scores on the Oswestry disability index (two and six months), scores on the Roland and Morris disability questionnaire and SF-36 (2, 6 and 12 months), and patient perceived benefit from treatment (2, 6, and 12 months).

Results 200 of 286 patients (70%) provided follow up information at 12 months. Patients in the therapy group reported enhanced perceptions of benefit, but there was no evidence of a long term effect of physiotherapy in either disease specific or generic outcome measures (mean difference in change in Oswestry disability index scores at 12 months -1.0%, 95% confidence interval -3.7% to 1.6%). The most common treatments were low velocity spinal joint mobilisation techniques (72%, 104 of 144 patients) and lumbar spine mobility and abdominal strengthening exercises (94%, 136 patients).

Conclusions Routine physiotherapy seemed to be no more effective than one session of assessment and advice from a physiotherapist.

Introduction

Disability associated with low back pain is a major public health problem in Western societies.^1-4 Back pain is the most common cause of physical disability in the working age population of the United Kingdom.² In 1998, the direct healthcare costs for back pain in the United Kingdom were estimated at £1632m ($2932m; 2423m), with physiotherapy accounting for £251m.³ Physiotherapy is a tailored intervention that is usually focused on physical factors, including a combination of joint mobilisation, advice, and individual exercise programmes.⁵

Physiotherapists in the British NHS treat around 1.3 million people for low back pain each year, but there is only weak evidence for the effectiveness of routine physiotherapy and no evidence for the effectiveness of electrotherapy, laser treatment, ultrasound therapy, or traction.^{2 6}

International guidelines vary but agree on advising patients with low back pain to remain physically active and prescribing appropriate analgesics. They recommend exercise therapy for patients with chronic low back pain (> 12 weeks' duration) and some suggest spinal manipulation for acute or subacute low back pain.^7-9 We investigated the effectiveness of physiotherapy, as commonly practised in the British NHS, over a year for patients with low back pain compared with one session of assessment and advice from a physiotherapist.

Methods

The protocol for the treatment arm allowed physiotherapists to select from a range of manual therapy techniques and exercise treatments. Patients were recruited from the health service settings where they received the treatment.

Participants and eligibility
We carried out a multicentre, investigator blinded, randomised controlled trial, with written consent from all the patients. Participants were identified from physiotherapy referrals made by general practitioners and consultants. They were invited to participate from seven physiotherapy departments based in NHS outpatient departments in Oxfordshire and Reading, Berkshire.

Research therapists in each of the centres contacted the patients to check eligibility. The baseline assessment included red flag screening questions to exclude the possibility of serious disease.⁹

Our inclusion criteria were age 18 years and over with low back pain for at least six weeks with or without leg pain or neurological signs. We excluded patients with serious conditions, including systemic rheumatological disease, gynaecological problems, ankylosing spondylitis, tumours, infection, past spinal operations, and treatment for physical problems in the past month. We also excluded patients referred for intensive functional restoration programmes.

Outcome measures
Our primary outcome measure was scores on the Oswestry disability index at 12 months: 0% (no disability) to 100% (totally disabled or bed ridden).¹⁰

Our secondary outcome measures were scores on the Oswestry disability index at two and six months and scores on the Roland and Morris disability questionnaire at 2, 6, and 12 months.^{10 11} This questionnaire contains 24 items relating to a range of functions commonly affected by low back pain: 0 (best health) to 24 (worst health). General health was measured with the SF-36 at 2, 6, and 12 months (higher scores indicate better health).¹² Patient perceived benefit of treatment was measured on a scale from 0 (no benefit) to 10 (maximum benefit) and on a dichotomous scale (perceived benefit or no perceived benefit).

Follow up data were collected by postal questionnaire by a research assistant blind to treatment allocation. Non-responders received reminders by post. If this was unsuccessful the patients were telephoned. Data were double entered.

Intervention
Patients were randomised to receive advice to remain active (advice only group) or advice and a standard course of physiotherapy (therapy group). Both groups were given an advice book, and information from this was discussed with the physiotherapist.¹³ Advice was directed towards promoting self-management and modifying beliefs and behaviour. Physiotherapy was initiated within the week after randomisation.

Advice only group
Patients in the advice only group received one session with a physiotherapist, who carried out a physical examination and gave general advice to remain active, as specified in the advice book. The session lasted for up to an hour.

Therapy group
Patients in the therapy group underwent a physical examination by physiotherapists, lasting up to one hour. In line with usual practice, the physiotherapists chose a treatment strategy based on their findings but agreed to treat according to a standardised protocol reflecting routine NHS practice.⁵ This included any combination of joint mobilisation and manipulation; soft tissue techniques, including stretching; spinal mobility and strengthening exercises; heat or cold treatment; and advice. The protocol specified up to five additional treatment sessions of around 30 minutes. Physiotherapists recorded the type and number of sessions.

Randomisation and blinding
The allocation sequence was determined before the study by a research assistant using a computer generated random number sequence.¹⁴ Groups were coded and the allocation transferred to opaque, sealed, sequentially numbered envelopes. No stratification was used.

The allocation was concealed from the research therapist who carried out the baseline assessment, the data manager who recorded the data, and the statistician carrying out the analysis. The code for the grouping was known only to the physiotherapists treating the patients. The allocation was concealed from each patient until the first appointment.

Although the investigators were blinded to treatment allocation, it was not possible to mask the intervention from the patients or the physiotherapists beyond the baseline assessment for practical and ethical reasons. The baseline assessment was carried out by the research therapist before randomisation.

Statistical analysis
We estimated the required sample size a priori, assuming a power of 90% and an of 0.05.¹⁵ Our sample size was calculated to detect a minimally clinically important difference between groups of 4% (standard deviation 8.0%) points in scores on the Oswestry disability index, giving an estimated sample size of 112 patients in each group (224 in total). We aimed to recruit at least 270 patients to allow for losses during follow up.

All analyses were performed on an intention to treat basis. To address potential biases due to incomplete follow up, we analysed patients with complete data at all time points and those with data at any time point, using the last known value carried forward to replace missing values. Outcome data for change in scores from baseline were compared between the groups. Bias due to non-response was assessed at each follow up.

The distributions of data were checked to ensure that parametric assumptions were met, and non-parametric analyses were used when appropriate. We used independent t tests or Mann-Whitney U tests for continuous data and ² tests for categorical data for unadjusted comparisons. Analysis of covariance was used to assess the effects of treatment at each time point, with baseline scores as the covariate, and adjusting for differences in age, sex, smoking status, and time since first episode of back pain. We examined the effects of treatment over all time points using repeated measures analysis of covariance. Relative risks were used to assess the differences between the groups for perceived benefit of physiotherapy, with logistic regression used for adjusted comparisons. Data are presented as mean (standard deviation) scores or numbers (percentages), with 95% confidence intervals. Data were analysed with SPSS version 10.0.

Results

Between October 1997 and January 2001 we randomised 286 (56.3%) of 508 patients who had been assessed for eligibility: 144 were allocated to therapy and 142 to advice only (fig 1). Table 1 lists the patients' characteristics. Although the advice only group had a slightly greater proportion of men and smokers, the groups were well balanced otherwise.

View this table: [in this window] [in a new window]   Table 1 Personal characteristics at baseline of 286 patients allocated to receive physiotherapy and advice for low back pain or advice only. Values are numbers (percentages) unless stated otherwise

 

Treatment
The patients were treated by 76 physiotherapists, reflecting the high turnover of staff in British NHS hospitals. About half (53%) of all treatments were carried out by 29 senior 1 therapists, 32% by 25 senior 2 therapists, and the remainder by junior grades. Treatment in the therapy group included joint mobilisation using low velocity thrusts (104 of 144 patients; 72%); soft tissue techniques (20; 14%); specific exercises (for example, McKenzie regimens),¹⁶ abdominal stability or strengthening exercises, and general mobility exercises for the lumbar spine (136; 94%); and heat (9; 6%) or cold treatment (4; 3%). The use of high velocity thrusts was rare (4; 3%).

Overall, 82% of patients in both groups complied with treatment. Patients in the therapy group received a median number of five (range 1-12) sessions, with 118 (82%) having six or fewer. Twenty six (18%) patients received more than six sessions as a result of decisions made by the physiotherapist. The median number of sessions in the advice only group was one (range 1-22). The number of single sessions was 116, with 26 patients receiving extra sessions either because they were unhappy with advice only (eight patients), because the physiotherapist deemed it unethical to withhold further treatment (for example, sudden increase in severe pain; four patients), or because the patient had been rereferred by his or her general practitioner for more treatment (two patients). No reason was given for extra sessions in the other patients.

Bias due to non-response
Overall, 30% of patients failed to provide data for the main outcome at 12 months. Only minor differences were found in the characteristics of people completing or not completing the Oswestry disability index at all follow up points: responders were older (mean age 43 (SD 15) v 37 (13); P < 0.001), less likely to smoke (39 (22%) v 50 (47%); P < 0.001), and more likely to have a first episode of back pain or a history of chronic back pain (39 (23%) v 14 (15%) and 43 (25%) v 14 (15%), respectively; P=0.009).

View larger version (45K): [in this window] [in a new window]   Flow of patients through trial

 

Outcome measures and patient perceived treatment benefit
We found no differences between the groups in change in scores on the Oswestry disability index at 12 months (mean difference -1.04, 95% confidence interval -3.7 to 1.59). Tables 2 and 3 show the results derived from the last value carried forward analysis.

View this table: [in this window] [in a new window]   Table 2 Mean (SD) change in disease specific scores at 2, 6, and 12 months from baseline for patients receiving physiotherapy or advice only for low back pain, with missing data replaced using last value carried forward

 

View this table: [in this window] [in a new window]   Table 3 Mean (SD) change in SF-36 domain scores at 2, 6 and 12 months from baseline for patients receiving physiotherapy or advice only for low back pain, with missing data replaced using last value carried forward

 

At 12 months the mean difference in domain scores on the SF-36 were: physical function (2.76, 95% confidence interval -1.91 to 7.42), role physical (0.68, -9.54 to 10.9), bodily pain (6.16, 0.45 to 11.9), general health (-0.31, -4.15 to 3.53), vitality (1.45, -2.41 to 5.32), social functioning (3.26, -2.39 to 8.91), role emotional (8.65, -0.87 to 18.2), and mental health (2.19, -1.59 to 5.97). Patients in the therapy group reported greater improvements for mental health and physical functioning at two months than the advice only group. On the basis of non-significant repeated measures analysis of covariance, however, these results are likely to be attributable to multiple testing. Overall, the data are consistent with no benefit from additional physiotherapy. Results from both methods of analysis were similar.

Patients in the therapy group were more likely to report benefits from treatment at both two and six months and also more benefit on the 0-10 rating scale at all time points than patients in the advice only group (table 4).

View this table: [in this window] [in a new window]   Table 4 Patient perceived benefits of treatment at 2, 6, and 12 months after randomisation, with missing data replaced using last value carried forward

 

Discussion

Routine physiotherapy for mild to moderate low back pain generally practised in the United Kingdom is no more effective than a session with a physiotherapist that includes advice. The patients' perception of treatment benefit was, however, in conflict with the validated outcome measures, and the clinical importance of this finding needs further investigation.

Our trial does not provide information on the effectiveness of advice compared with no intervention, but other trials suggest that advice supported by a booklet is a useful intervention when compared with usual care given by a general practitioner as long as the information is reinforced by all involved in the patients care.^{17 18} Although physiotherapists usually give advice, the book we chose is not used as standard practice in most physiotherapy departments. Spinal manipulation, which physiotherapists can provide after specialist postgraduate training, was negligible in our trial, although some international guidelines suggest that it may be helpful for acute or subacute low back pain.

There were only a few minor differences in baseline characteristics between patients who did or did not provide complete data, but the internal validity of our study is limited because 30% of patients failed to provide data for the main outcomes at 12 months.

We addressed potential bias by replacing missing data with the last value carried forward. Estimates of the effect of treatment were similar with both methods of analysis. Our trial highlights the difficulty in interpreting results with relatively high rates of non-response. Other trials of low back pain report similar findings, and researchers should be aware of this when designing trials for the future.^{17 19}

Compliance with treatment is rarely assessed or adequately reported in randomised controlled trials, and although it is common for patients to seek additional treatment, little is reported or known about the clinicians' compliance with trial protocols.²⁰ We encouraged only physiotherapists who reported clinical equipoise to be involved in the trial, but the reasons for non-compliance are complex and we could not control for clinical decisions made on the basis of patients' fluctuating symptoms and physiotherapists' beliefs about the effectiveness of treatment.

Comparison with related research
According to disease specific outcomes, our participants had mild to moderate low back pain. The SF-36 scores in our trial population were similar to those of patients with back pain in the general population consulting physiotherapists and worse than those of non-consulting patients with back pain.²¹

Similar baseline disease specific disability scores have been reported in only one other British study of patients with subacute low back pain.²² This trial found larger health gains in patients who attended a fitness programme to increase confidence in the use of their spine and to overcome fear of exercise. This suggests that exercise programmes with good compliance that are graded to ensure improvements in cardiovascular or muscular strength are more beneficial than routine physiotherapy carried out in this trial and generally practised in the United Kingdom.⁵

Our results are generalisable since patients were recruited from routine referrals, and the interventions included commonly delivered treatments Despite patient perceived benefits captured by a global indicator, the results suggest that the traditional model of physiotherapy should be challenged.

What is already known on this topic International guidelines for patients with low back pain vary All agree that patients should be advised to stay active; some suggest spinal manipulation for acute and subacute low back pain and most advise exercise therapy for chronic low back pain It is unclear which type or intensity of exercise is most effective and strong evidence is lacking for the effectiveness of other treatments What this study adds Routine physiotherapy for patients with mild to moderate low back pain is no more effective in the long term than advice given by a physiotherapist

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Results for patients with valid data at each assessment are on bmj.com

We thank the physiotherapists: Farida Barma, David Beard, Helen Dawes, Kirstie Haywood, Valerie McKee, Mary Pinkney, and Liz Walker; the senior physiotherapists and managers, particularly Emy Pilgrim, involved in the initial planning of the trial; the 76 physiotherapists for their cooperation and treatment of patients; and the participants. This trial was begun and implemented while HF and SEL were working in the Physiotherapy Research Unit, Nuffield Orthopaedic Centre Oxford, and we thank the staff for their help. We thank Oliver Rivero-Arias for his comments on the early drafts.

Contributors: HF and SS-B developed the protocol, secured initial funding, and implemented the study. HF, SS-B and SEL obtained long term funding and directed the study. HD carried out the main statistical analysis. HF wrote the original draft with SS-B, SEL, and HD. PT-C helped with the final draft, entered the data, organised the trial, and carried out some categorical analysis of data. HF, SEL, and SS-B are guarantors.

Funding: Arthritis Research Campaign.

Competing interests: None declared.

Ethical approval: This study was approved by the Oxford Nursing and Allied Professions research ethics committee and the West Berkshire local ethics committee.

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(Accepted 19 July 2004)

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Peter J Ward
bmj.com, 1 Oct 2004 [Full text]

More chiropractic biscuits

Richard Bartley
bmj.com, 1 Oct 2004 [Full text]

Is Physiotherapy effective for the management of LBP?

Fraser Ferguson, et al.
bmj.com, 1 Oct 2004 [Full text]

Treat Underlying Aetiology

Nick D Critchley
bmj.com, 1 Oct 2004 [Full text]

Reply to Nash, Ward

Dr. Glenn F. Gumaer
bmj.com, 2 Oct 2004 [Full text]

Move on

Martin Jones
bmj.com, 3 Oct 2004 [Full text]

Re: Last chiropractic biscuits

Jarkko O. Kause,DC
bmj.com, 3 Oct 2004 [Full text]

Politically acceptable research results ?

Tom A Torstensen, B.Sc (Hons), M.Sc., P.T., specialist in manipulative therapy, M.N.F.F.
bmj.com, 4 Oct 2004 [Full text]

Chiropractic & Osteopathy

Corey Watts
bmj.com, 4 Oct 2004 [Full text]

Alas further confounding appraisal

Brian Sweetnam
bmj.com, 7 Oct 2004 [Full text]

Don't dismiss physiotherapy

Neil Watson
bmj.com, 12 Oct 2004 [Full text]

A theory that is refutable can still be charming

Dr. Herbert H. Nehrlich
bmj.com, 13 Oct 2004 [Full text]

Publishing responsibilities

Neil Watson
bmj.com, 14 Oct 2004 [Full text]

Acupuncture for treatment of low back pain

Janet Boaler
bmj.com, 15 Oct 2004 [Full text]

Good assessment and advice by a physiotherapist is as effective as traditional physiotherapy.

Abdolkarim Karimi
bmj.com, 15 Oct 2004 [Full text]

Back pain treatment is anything but patient centred!

Murray Flett
bmj.com, 18 Oct 2004 [Full text]

Low Back Pain and Physiotherapy

Friederike I.M. von Rabenau
bmj.com, 23 Oct 2004 [Full text]

Targeting ‘physical factors’ alone is not evidence-based practice

Maureen Simmonds, et al.
bmj.com, 16 Nov 2004 [Full text]

Important Oversight

Tom Caumont
bmj.com, 9 Dec 2004 [Full text]

Physiotherapy and low back pain

Meir Lotan, et al.
bmj.com, 23 Dec 2004 [Full text]

Proper Title: Trial of NHS Physiotherapy compared with advice for LBP

Brad S Stevens
bmj.com, 10 Oct 2005 [Full text]

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