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Meta-Analysis
. 2014 Apr 22;2014(4):CD007912.
doi: 10.1002/14651858.CD007912.pub2.

Exercise for osteoarthritis of the hip

Marlene Fransen  1 , Sara McConnell, Gabriela Hernandez-Molina, Stephan Reichenbach
Affiliations
Meta-Analysis

Exercise for osteoarthritis of the hip

Marlene Fransen et al. Cochrane Database Syst Rev. .

Abstract

Background: Current international treatment guidelines recommending therapeutic exercise for people with symptomatic hip osteoarthritis (OA) report are based on limited evidence.

Objectives: To determine whether land-based therapeutic exercise is beneficial for people with hip OA in terms of reduced joint pain and improved physical function and quality of life.

Search methods: We searched five databases from inception up to February 2013.

Selection criteria: All randomised controlled trials (RCTs) recruiting people with hip OA and comparing some form of land-based therapeutic exercise (as opposed to exercises conducted in water) with a non-exercise group.

Data collection and analysis: Four review authors independently selected studies for inclusion. We resolved disagreements through consensus. Two review authors independently extracted data, assessed risk of bias and the quality of the body of evidence for each outcome using the GRADE approach. We conducted analyses on continuous outcomes (pain, physical function and quality of life) and dichotomous outcomes (proportion of study withdrawals).

Main results: We considered that seven of the 10 included RCTs had a low risk of bias. However, the results may be vulnerable to performance and detection bias as none of the RCTs were able to blind participants to treatment allocation and, while most RCTs reported blinded outcome assessment, pain, physical function and quality of life were participant self reported. One of the 10 RCTs was only reported as a conference abstract and did not provide sufficient data for the evaluation of bias risk.High-quality evidence from nine trials (549 participants) indicated that exercise reduced pain (standardised mean difference (SMD) -0.38, 95% confidence interval (CI) -0.55 to -0.20) and improved physical function (SMD -0.38, 95% CI -0.54 to -0.05) immediately after treatment. Pain and physical function were estimated to be 29 points on a 0- to 100-point scale (0 was no pain or loss of physical function) in the control group; exercise reduced pain by an equivalent of 8 points (95% CI 4 to 11 points; number needed to treat for an additional beneficial outcome (NNTB) 6) and improved physical function by an equivalent of 7 points (95% CI 1 to 12 points; NNTB 6). Only three small studies (183 participants) evaluated quality of life, with overall low quality evidence, with no benefit of exercise demonstrated (SMD -0.07, 95% CI -0.23 to 0.36). Quality of life was estimated to be 50 points on a norm-based mean (standard deviation (SD)) score of 50 (10) in the general population in the control group; exercise improved quality of life by 0 points. Moderate-quality evidence from seven trials (715 participants) indicated an increased likelihood of withdrawal from the exercise allocation (event rate 6%) compared with the control group (event rate 3%), but this difference was not significant (risk difference 1%; 95% CI -1% to 4%). Of the five studies reporting adverse events, each study reported only one or two events and all were related to increased pain attributed to the exercise programme.The reduction in pain was sustained at least three to six months after ceasing monitored treatment (five RCTs, 391 participants): pain (SMD -0.38, 95% CI -0.58 to -0.18). Pain was estimated to be 29 points on a 0- to 100-point scale (0 was no pain) in the control group, the improvement in pain translated to a sustained reduction in pain intensity of 8 points (95% CI 4 to 12 points) compared with the control group (0 to 100 scale). The improvement in physical function was also sustained (five RCTs, 367 participants): physical function (SMD -0.37, 95% CI -0.57 to -0.16). Physical function was estimated to be 24 points on a 0- to 100-point scale (0 was no loss of physical function) in the control group, the improvement translated to a mean of 7 points (95% CI 4 to 13) compared with the control group.Only five of the 10 RCTs exclusively recruited people with symptomatic hip OA (419 participants). There was no significant difference in pain or physical function outcomes compared with five studies recruiting participants with hip or knee OA (130 participants).

Authors' conclusions: Pooling the results of these 10 RCTs demonstrated that land-based therapeutic exercise programmes can reduce pain and improve physical function among people with symptomatic hip OA.

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Conflict of interest statement

None.

Figures

1
1
Study flow diagram.
2
2
Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
3
3
Forest plot of comparison: 1.1 Pain.
4
4
Forest plot of comparison: 1.2 Physical function.
5
5
Sustainability (three to six months), outcome: 2.1 Pain.
6
6
2 Sustainability (three to six months), outcome: 2.2 Physical function.
1.1
1.1. Analysis
Comparison 1 Immediate post treatment, Outcome 1 Pain.
1.2
1.2. Analysis
Comparison 1 Immediate post treatment, Outcome 2 Physical function.
1.3
1.3. Analysis
Comparison 1 Immediate post treatment, Outcome 3 Quality of life.
1.4
1.4. Analysis
Comparison 1 Immediate post treatment, Outcome 4 Study withdrawals.
2.1
2.1. Analysis
Comparison 2 Sustainability (three to six months), Outcome 1 Pain.
2.2
2.2. Analysis
Comparison 2 Sustainability (three to six months), Outcome 2 Physical function.
3.1
3.1. Analysis
Comparison 3 Hip osteoarthritis (OA) versus hip/knee OA studies, Outcome 1 Pain post treatment.
3.2
3.2. Analysis
Comparison 3 Hip osteoarthritis (OA) versus hip/knee OA studies, Outcome 2 Physical function post treatment.
See this image and copyright information in PMC

Update of

References

References to studies included in this review

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References to other published versions of this review

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