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Research ArticleResearch

PEER umbrella systematic review of systematic reviews

Management of osteoarthritis in primary care

Joey Ton, Danielle Perry, Betsy Thomas, G. Michael Allan, Adrienne J. Lindblad, James McCormack, Michael R. Kolber, Scott Garrison, Samantha Moe, Rodger Craig, Nicolas Dugré, Karenn Chan, Caitlin R. Finley, Rhonda Ting and Christina S. Korownyk
Canadian Family Physician March 2020, 66 (3) e89-e98;
Joey Ton
Pharmacist and Clinical Evidence Expert for the College of Family Physicians of Canada in Edmonton, Alta.
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Danielle Perry
Nurse and Clinical Evidence Expert at the Alberta College of Family Physicians in Edmonton.
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Betsy Thomas
Pharmacist and Project Manager, Education and Knowledge Translation at the Alberta College of Family Physicians.
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G. Michael Allan
Family physician, Director of Programs and Practice Support at the College of Family Physicians of Canada, and Professor in the Department of Family Medicine at the University of Alberta.
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Adrienne J. Lindblad
Pharmacist and Knowledge Translation and Evidence Coordinator at the Alberta College of Family Physicians and Associate Clinical Professor in the Department of Family Medicine at the University of Alberta.
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James McCormack
Professor in the Faculty of Pharmaceutical Sciences at the University of British Columbia in Vancouver.
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Michael R. Kolber
Family physician and Professor in the Department of Family Medicine at the University of Alberta.
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Scott Garrison
Family physician and Associate Professor in the Department of Family Medicine at the University of Alberta.
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Samantha Moe
Pharmacist and Clinical Evidence Expert at the College of Family Physicians of Canada in Toronto.
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Rodger Craig
Medical student at the University of Alberta.
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Nicolas Dugré
Pharmacist at the CIUSSS du Nord-de-l’Ȋle-de-Montréal and Clinical Associate Professor in the Faculty of Pharmacy at the University of Montreal in Quebec.
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Karenn Chan
Care of the elderly physician and Assistant Professor in the Department of Family Medicine at the University of Alberta.
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Caitlin R. Finley
Medical student at the University of Alberta.
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Rhonda Ting
Doctoral student in the Faculty of Pharmacy and Pharmaceutical Sciences at the University of Alberta.
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Christina S. Korownyk
Family physician and Associate Professor in the Department of Family Medicine at the University of Alberta.
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  • For correspondence: cpoag@ualberta.ca
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Abstract

Objective To determine how many patients with chronic osteoarthritis pain respond to various non-surgical treatments.

Data sources PubMed and the Cochrane Library.

Study selection Published systematic reviews of randomized controlled trials (RCTs) that included meta-analysis of responder outcomes for at least 1 of the following interventions were included: acetaminophen, oral nonsteroidal anti-inflammatory drugs (NSAIDs), topical NSAIDs, serotonin-norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants, cannabinoids, counseling, exercise, platelet-rich plasma, viscosupplementation, glucosamine, chondroitin, intra-articular corticosteroids, rubefacients, or opioids.

Synthesis In total, 235 systematic reviews were included. Owing to limited reporting of responder meta-analyses, a post hoc decision was made to evaluate individual RCTs with responder analysis within the included systematic reviews. New meta-analyses were performed where possible. A total of 155 RCTs were included. Interventions that led to more patients attaining meaningful pain relief compared with control included exercise (risk ratio [RR] of 2.36; 95% CI 1.79 to 3.12), intra-articular corticosteroids (RR = 1.74; 95% CI 1.15 to 2.62), SNRIs (RR = 1.53; 95% CI 1.25 to 1.87), oral NSAIDs (RR = 1.44; 95% CI 1.36 to 1.52), glucosamine (RR = 1.33; 95% CI 1.02 to 1.74), topical NSAIDs (RR = 1.27; 95% CI 1.16 to 1.38), chondroitin (RR = 1.26; 95% CI 1.13 to 1.41), viscosupplementation (RR = 1.22; 95% CI 1.12 to 1.33), and opioids (RR = 1.16; 95% CI 1.02 to 1.32). Preplanned subgroup analysis demonstrated no effect with glucosamine, chondroitin, or viscosupplementation in studies that were only publicly funded. When trials longer than 4 weeks were analyzed, the benefits of opioids were not statistically significant.

Conclusion Interventions that provide meaningful relief for chronic osteoarthritis pain might include exercise, intra-articular corticosteroids, SNRIs, oral and topical NSAIDs, glucosamine, chondroitin, viscosupplementation, and opioids. However, funding of studies and length of treatment are important considerations in interpreting these data.

Osteoarthritis is one of the most common chronic medical conditions experienced by older persons and a frequent reason patients visit their primary care providers.1,2 The hallmark of diagnosis of osteoarthritis is pain (most commonly in the knees, hips, shoulders, and hands), and many patients experience impairment in function and quality of life.3

Various interventions have been evaluated for the management of osteoarthritis in primary care. These interventions are frequently evaluated in isolation, making it difficult to determine the relative efficacy of individual treatments.4–7 Guideline groups have performed systematic reviews of multiple interventions; however, they generally report standard mean differences or the direction of effect—outcomes that are not readily translatable to clinical practice.8,9 The reporting of average improvement in pain scores is not always clinically useful, as patients might not get an average response.10 For this reason, some have advocated that analysis of responders—the proportion of patients achieving outcomes that patients consider meaningful—provides a clearer picture of how many patients will receive clinical benefit from a specific therapeutic intervention.10

We therefore performed a systematic review of systematic reviews with a focus on randomized controlled trials (RCTs) that included a responder analysis in the treatment of osteoarthritis. This review will provide practical information to assist with shared informed decision making in the management of osteoarthritis pain.

METHODS

We followed the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) and systematic review of systematic reviews protocols.11,12

Data sources

Two authors (J.T., D.P.), in consultation with a medical librarian, performed a search for systematic reviews of RCTs in the PubMed and Cochrane databases. For both databases, all articles published up to and including in April 2019 were searched using the key words osteoarthritis and systematic review.

Systematic review selection

Inclusion criteria included systematic reviews of RCTs in adults with osteoarthritis. The RCTs had to be placebo controlled for all interventions except for exercise, for which placebo control is not possible. Reviews had to include one of the following interventions: acetaminophen, oral nonsteroidal anti-inflammatory drugs (NSAIDs), topical NSAIDs, serotonin-norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants, cannabinoids, counseling, exercise, platelet-rich plasma, viscosupplementation, glucosamine, chondroitin, intraarticular corticosteroids, rubefacients, or opioids. Systematic reviews that included more than 1 unique treatment for osteoarthritis pain were also included. We excluded non-English systematic reviews, studies of back osteoarthritis, and pediatric and nonhuman studies. Dual title, abstract, and full-text reviews were completed to determine eligibility based on the above criteria (completed by D.P., J.T., B.T., C.S.K., A.J.L., G.M.A., S.M., S.G., J.M., M.R.K., N.D., K.C., R.C., R.T., C.R.F.). Disagreements over inclusion were resolved by third-party consensus.

Systematic reviews that focused on a single intervention and met criteria for inclusion were ranked based on publication year, inclusion of a responder meta-analysis (assessment of proportion of patients who achieved a clinically meaningful improvement in pain), and a modified AMSTAR (A Measurement Tool to Assess Systematic Reviews) quality assessment.13 For each intervention, the top 5 systematic reviews were used where available. In addition, 5 systematic reviews that focused on multiple interventions for osteoarthritis were chosen based on the publication date. This was done to ensure recent clinical trials were not missed.

As responder meta-analyses were infrequently reported and not consistently available for each intervention, we made a post hoc decision to use individual RCTs from the identified systematic reviews for the responder analysis.

Data extraction

A Microsoft Excel extraction template was developed and used to record RCT data via dual extraction. This included author, publication year, report of responder analysis, responder outcome, number of patients, osteoarthritis location, intervention, comparator, duration of study, duration of treatment at which the outcome was reported, and intervention and placebo outcome rates.

Data synthesis

We created a hierarchy of responder outcomes, prioritizing the Osteoarthritis Research Society International responder criteria and scales assessing pain rather than pain and function.14 Pain was prioritized over function, as pain predominates the lived experience of osteoarthritis and is often the presenting issue in primary care offices.15 The hierarchy of responder outcomes can be found in the appendix, available from CFPlus* (Table A1). The highest ranked outcome at the longest reported followup was included in the meta-analysis for each intervention. We made an a priori decision to perform subgroup analyses that included the size of the trial (< 150 patients and ≥ 150 patients), funding (industry or clearly publicly funded), and duration (≤ 4 weeks, > 4 to < 12 weeks, and ≥ 12 weeks). We hypothesized that larger, longer, and publicly funded trials would be at lower risk of bias and less likely to overexaggerate benefit.

Quality assessment

We used the Grading of Recommendations Assessment, Development and Evaluation (GRADE) tool to report the certainty of the evidence.16 Confidence of each outcome was evaluated based on risk of bias, inconsistency, indirectness, imprecision, and publication bias.

Adverse events

Meta-analyzed adverse event data were extracted from included systematic reviews for each intervention. In cases where the 5 most recent systematic reviews failed to provide quantifiable adverse event data, we reviewed up to 20 of the most recent reviews previously identified in our initial search.

SYNTHESIS

Figure 1 provides details of the study flow (PRISMA) for 1757 unique articles. After exclusion by title and abstract, full-text review was performed on 353 articles, and 118 were excluded for various reasons, leaving a total of 235 systematic reviews.

Figure 1.
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Figure 1.

PRISMA study flow: Osteoarthritis interventions.

PRISMA—Preferred Reporting Items for Systematic Reviews and Meta-Analyses, RCT—randomized controlled trial.

Full details of the primary efficacy results are available in Table 1, with interventions arranged in order of decreasing efficacy (based on risk ratios [RRs]). Full details of the subgroup analysis on funding source are available in Table 2. Individual metagraphs for responder outcomes for the longest reported outcomes, as well as subgroup analyses of size, funding, and duration are available from CFPlus (Figures A1 to A10).* Adverse events that could be retrieved from meta-analyses in systematic reviews are available from CFPlus (Table A2).*

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Table 1.

Proportion of patients attaining meaningful pain relief for each intervention compared with control: Ordered by descending efficacy (based on risk ratio).

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Table 2.

Proportion of patients with a clinically meaningful response, based on funding source: Only studies with clear public or industry funding were analyzed. Those with unclear funding sources were not included in the analysis.

Treatment options

Exercise.

Eleven RCTs with 1367 patients followed for 6 to 104 weeks were suitable for meta-analysis. The most common type of exercise included was physiotherapy-guided exercise programs. Meta-analysis revealed 47% of patients receiving exercise therapy and 21% in the control group attained meaningful pain relief (RR = 2.36; 95% CI 1.79 to 3.12), for a number needed to treat (NNT) of 4 (Figure 2).17–22 No industry-funded trials were identified. Primary and subgroup meta-analyses are available from CFPlus (Figures A1a–d).*

Figure 2.
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Figure 2.

Proportion of patients who attained meaningful pain relief with exercise compared with control

*Mantel-Haenszel random-effects method.

Meta-analysis of studies from Fransen et al,17,18 Goh et al,19 Hurley et al,20 Rausch Osthoff et al,21 and Tanaka et al.22

Intra-articular corticosteroids.

Seven RCTs with 706 patients followed for 4 to 24 weeks were suitable for meta-analysis. Meta-analysis revealed 50% of patients receiving steroid injections and 31% receiving placebo attained meaningful pain relief (RR = 1.74; 95% CI 1.15 to 2.62), for an NNT of 6. Studies 12 weeks or longer showed no difference from placebo. Primary and subgroup meta-analyses are available from CFPlus (Figures A2a–e).*

SNRIs (duloxetine only).

Six RCTs with 2060 patients followed for 10 to 18 weeks were suitable for meta-analysis (all examining duloxetine). Meta-analysis revealed 64% of patients receiving duloxetine and 43% receiving placebo attained meaningful pain relief (RR = 1.53; 95% CI 1.25 to 1.87), for an NNT of 5. No publicly funded trials were identified. Primary and subgroup meta-analyses are available from CFPlus (Figures A3a–d).*

Oral NSAIDs.

Forty-three RCTs with 28 699 patients followed for 4 to 104 weeks were suitable for meta-analysis. Meta-analysis revealed 57% of patients receiving oral NSAIDs and 39% receiving placebo attained meaningful pain relief (RR = 1.44; 95% CI 1.36 to 1.52), for an NNT of 6. In a subgroup analysis of trial funding, the publicly funded trial demonstrated smaller benefit (RR = 1.18; 95% CI 1.05 to 1.34). Primary and subgroup meta-analyses are available from CFPlus (Figures A4a–e).*

Glucosamine.

Nine RCTs with 1643 patients followed for 4 to 156 weeks were suitable for meta-analysis. Meta-analysis revealed 47% of patients receiving glucosamine and 37% receiving placebo attained meaningful pain relief (RR = 1.33; 95% CI 1.02 to 1.74), for an NNT of 11. In a subgroup analysis of trial funding, publicly funded trials found no significant benefit with glucosamine versus placebo (RR = 0.99; 95% CI 0.76 to 1.28). Primary and subgroup meta-analyses are available from CFPlus (Figures A5a–e).*

Topical NSAIDs.

Twenty-two RCTs with 7265 patients followed for 1 to 12 weeks were suitable for meta-analysis. Meta-analysis revealed 61% of patients receiving topical NSAIDs and 47% receiving placebo attained meaningful pain relief (RR = 1.27; 95% CI 1.16 to 1.38), for an NNT of 8. No publicly funded trials were identified. Primary and subgroup meta-analyses are available from CFPlus (Figures A6a–e).*

Chondroitin.

Nine RCTs with 2477 patients followed for 12 to 48 weeks were suitable for meta-analysis. Meta-analysis revealed 57% of patients receiving chondroitin and 45% receiving placebo attained meaningful pain relief (RR = 1.26; 95% CI 1.13 to 1.41), for an NNT of 9. In a subgroup analysis of trial funding, the publicly funded trial did not demonstrate a statistically significant benefit (RR = 1.12; 95% CI 0.98 to 1.27). Primary and subgroup meta-analyses are available from CFPlus (Figure A7a–e).*

Viscosupplementation.

Thirty-one RCTs with 6254 patients followed for 2 to 160 weeks were suitable for meta-analysis. Meta-analysis revealed 53% of patients receiving viscosupplementation and 44% receiving placebo attained meaningful pain relief (RR = 1.22; 95% CI 1.12 to 1.33), for an NNT of 11. In a subgroup analysis of trial funding, the publicly funded trial did not demonstrate a statistically significant benefit (RR = 1.11; 95% CI 0.73 to 1.70). Primary and subgroup meta-analyses are available from CFPlus (Figures A8a–e).*

Opioids.

Fifteen RCTs with 6266 patients followed for 10 days to 24 weeks were suitable for meta-analysis. Meta-analysis revealed 47% of patients receiving opioids and 43% receiving placebo attained meaningful pain relief (RR = 1.16; 95% CI 1.02 to 1.32), for an NNT of 32. No publicly funded trials were identified. In a subgroup analysis of efficacy based on duration of treatment, opioids did not show statistically significantly more responders than placebo after 4 weeks (Figure 3).23–28 Primary and subgroup meta-analyses are available from CFPlus (Figures A9a–e).*

Figure 3.
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Figure 3.

Proportion of patients who attained meaningful pain relief with opioids compared with placebo: A) Meaningful response at ≤ 4 wk; B) meaningful response at > 4 and < 12 wk; and C) meaningful response at ≥ 12 wk.

NA—not applicable.

*Mantel-Haenszel random-effects method.

†Mantel-Haenszel fixed-effects method.

Meta-analysis of studies from Cepeda et al,23 da Costa et al,24 Manchikanti et al,25 Santos et al,26 Schaefert et al,27 and Toupin April et al.28

Acetaminophen.

Two RCTs with 991 patients followed for 6 to 24 weeks were suitable for meta-analysis. Meta-analysis revealed no statistically significant difference between acetaminophen and placebo (RR = 1.17; 95% CI 0.83 to 1.64). No publicly funded trials were identified. Primary and subgroup meta-analyses are available from CFPlus (Figures A10a–b).*

Rubefacients.

One RCT of 113 patients compared 0.025% capsaicin to vehicle placebo and found no statistical difference at 4, 8, or 12 weeks.29

Interventions lacking responder analysis.

We did not identify any systematic reviews that included a responder analysis for platelet-rich plasma injections, counseling, cannabinoids, or tricyclic antidepressants.

Quality assessment

The results of our modified AMSTAR assessment for each of the included systematic reviews is presented in Table A3, available from CFPlus.* Of 649 RCTs identified from systematic reviews across all interventions, 155 (24%) provided a responder analysis. Of those 155 RCTs, only 11 had at least 150 participants, were longer than 8 weeks, and were clearly publicly funded (Table 3). Heterogeneity of the primary outcome ranged from 48% to 82% (I2 statistic).

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Table 3.

Number of RCTs with responder analysis and quality characteristics

Adverse events

In general, adverse events were poorly and inconsistently reported in the systematic reviews (Table A2, available from CFPlus*). One outcome consistently reported across interventions is withdrawal due to adverse events. Withdrawals due to adverse events were not significantly greater for most interventions, except for opioids (number needed to harm [NNH] of 8 to 10), SNRIs (NNH = 15), topical NSAIDs (NNH = 50), and viscosupplementation (statistically significant, but absolute numbers not reported).

DISCUSSION

To our knowledge, this is the first meta-analysis to report responder data—a key patient-oriented outcome for osteoarthritis pain management—for a variety of interventions.

Our analysis suggests that exercise is an effective intervention for chronic osteoarthritis pain regardless of study size or time frame studied. Exercise has consistently been recommended by international guideline groups as the first-line treatment in osteoarthritis management. The type of exercise is likely not important.8,9,30–33

Pharmacotherapies such as NSAIDs and duloxetine demonstrate smaller but statistically significant benefit that continues beyond 12 weeks. Opioids appear to have short-term benefits that attenuate after 4 weeks, and intra-articular steroids after 12 weeks. Limited data (based on 2 RCTs) suggest that acetaminophen is not helpful. These findings are consistent with recent Osteoarthritis Research Society International guideline recommendations that no longer recommend acetaminophen for osteoarthritis pain management and strongly recommend against the use of opioids.8

Limited benefit was observed with other interventions including glucosamine, chondroitin, and viscosupplementation. When only publicly funded trials were examined for these interventions, the results were no longer statistically significant.

We found that adverse events were inconsistently reported in the systematic reviews, which is consistent with data suggesting that published studies under-report adverse events compared with unpublished studies.34 Overall, withdrawal due to adverse events was consistently reported and found to be greater in patients using opioids, SNRIs, topical NSAIDs, and viscosupplementation.

Strengths and limitations

Strengths of this review include a focus on responder analyses and the completion of a priori subgroup analyses for funding, trial size, and length. When data were available to compare public to industry-funded trials, we found that in most cases efficacy decreased in publicly funded trials. Limitations include the chosen design of this review. It is possible we missed RCTs that had not been identified in the included systematic reviews. In prioritizing RCTs with responder analysis, we might have inadvertently overestimated the treatment effect of some interventions, as RCTs that did not achieve a clinically important response might have been less likely to report these data. Heterogeneity was high for most outcomes, which might reflect differences in study populations (eg, affected joint), dosing, responder outcome reported, or other unidentified study differences.

The adverse events reported are likely missing potential serious and rare adverse events because these are not reported well in RCTs and are generally only captured comprehensively in observational studies, which follow large numbers of patients for long periods of time (eg, dependence potential of opioids, or NSAIDs and gastrointestinal bleeds).35,36

In 2000, a European League Against Rheumatism systematic review of 680 studies of knee osteoarthritis found that only 5 of them reported responder outcomes (20% reduction in pain).37 In our search, 155 (24%) RCTs included a responder analysis. Additional limitations include the lack of moderately sized publicly funded trials that followed patients for more than 8 weeks. Only 2% of trials met all these criteria in addition to the inclusion of responder analyses. This suggests that 98% of research being conducted is not meeting critical quality criteria to allow for accurate interpretation of potential treatment benefits of the multitude of available interventions for osteoarthritis. In an effort to facilitate shared informed decision making with our patients, future studies evaluating osteoarthritis interventions should be at least 12 weeks long, of reasonable size, and publicly funded, and report the proportion of patients with 30% or 50% improvement in pain.

Conclusion

Evidence suggests that exercise is an effective intervention for achieving meaningful pain relief in osteoarthritis. This is followed by intra-articular corticosteroids, SNRIs, oral and topical NSAIDs, glucosamine, chondroitin, viscosupplementation injections, and opioids. Both acetaminophen and rubefacients were similar to placebo. No efficacy responder data were identified for platelet-rich plasma, counseling, cannabinoids, or tricyclic antidepressants as treatment options for osteoarthritis. Adverse event data for interventions in osteoarthritis are limited and further research is required.

Findings of this systematic review were used to develop a clinical decision aid (page 191)38 and will be combined with similar systematic reviews and tools on other types of pain to inform future guideline development.

Acknowledgments

We thank Janice Kung, MLIS, for her assistance with creating the search strategy, our peer reviewers for their valuable feedback, and the Alberta College of Family Physicians and the College of Family Physicians of Canada for continued support. This project was funded by Alberta Health through the Primary Health Care Opioid Response Initiative.

Notes

Editor’s key points

  • ▸ Osteoarthritis is one of the most common chronic medical conditions experienced by older persons and a frequent reason patients visit their primary care providers. While various interventions have been evaluated, they are frequently evaluated in isolation, making it difficult to determine the relative efficacy of treatments. Systematic reviews of multiple interventions have generally reported standard mean differences or the direction of effect—outcomes not readily translatable to clinical practice.

  • ▸ Analysis of responders—the proportion of patients achieving outcomes patients consider meaningful—might provide a clearer picture of how many patients will receive clinical benefit from a therapeutic intervention. This systematic review of systematic reviews focused on randomized controlled trials that included meta-analysis of responder outcomes for non-surgical interventions.

  • ▸ Findings of this systematic review were used to develop a clinical decision aid (page 191) and will be combined with similar systematic reviews and tools on other types of pain to inform future guideline development.

Points de repère du rédacteur

  • ▸ L’arthrose est l’un des problèmes de santé chroniques les plus courants dont souffrent les personnes plus âgées et une fréquente motivation de leurs consultations auprès de leurs professionnels des soins primaires. Quoique diverses interventions aient été évaluées, elles le sont souvent isolément, ce qui complique la détermination de l’efficacité relative des traitements. Des revues systématiques sur de multiples interventions ont généralement signalé des différences de moyennes standard ou la direction des effets, mais ce sont des résultats qui ne sont pas aisément transposables à la pratique clinique.

  • ▸ L’analyse des sujets répondants, notamment la proportion de patients qui obtiennent des résultats qu’ils considèrent significatifs, pourrait dégager un portait plus clair du nombre de patients qui tireraient des bienfaits cliniques d’une intervention. Cette revue systématique de revues systématiques se concentre sur les études contrôlées randomisées qui incluent une méta-analyse des résultats chez les sujets répondants que procurent des interventions non chirurgicales.

  • ▸ Les constatations de cette revue systématique ont été utilisées pour élaborer une aide à la décision clinique (page e86), et elles seront combinées à des revues systématiques et à des outils semblables sur d’autres types de douleurs pour servir de fondement à la production de lignes directrices futures.

Footnotes

  • ↵* The hierarchy of responder outcomes; individual metagraphs for responder outcomes; subgroup analyses of size, funding, and duration; primary and subgroup meta-analyses for the various interventions; details of the GRADE analysis; the modified AMSTAR assessment; and the reported adverse events are available at www.cfp.ca. Go to the full text of the article online and click on the CFPlus tab.

  • Contributors

    All authors were part of the Evidence Review Team and contributed to preparing the manuscript for submission.

  • Competing interests

    None declared

  • This article has been peer reviewed.

  • Cet article a fait l’objet d’une révision par des pairs.

  • Copyright© the College of Family Physicians of Canada

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Canadian Family Physician: 66 (3)
Canadian Family Physician
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1 Mar 2020
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PEER umbrella systematic review of systematic reviews
Joey Ton, Danielle Perry, Betsy Thomas, G. Michael Allan, Adrienne J. Lindblad, James McCormack, Michael R. Kolber, Scott Garrison, Samantha Moe, Rodger Craig, Nicolas Dugré, Karenn Chan, Caitlin R. Finley, Rhonda Ting, Christina S. Korownyk
Canadian Family Physician Mar 2020, 66 (3) e89-e98;

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PEER umbrella systematic review of systematic reviews
Joey Ton, Danielle Perry, Betsy Thomas, G. Michael Allan, Adrienne J. Lindblad, James McCormack, Michael R. Kolber, Scott Garrison, Samantha Moe, Rodger Craig, Nicolas Dugré, Karenn Chan, Caitlin R. Finley, Rhonda Ting, Christina S. Korownyk
Canadian Family Physician Mar 2020, 66 (3) e89-e98;
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