Which Portion of Physiotherapy Treatments' Effect Is Not Attributable to the Specific Effects in People With Musculoskeletal Pain? A Meta-Analysis of Randomized Placebo-Controlled Trials.

This meta-analysis asked how much of physical therapy's effect on musculoskeletal pain comes from the specific treatment itself, versus factors shared with placebo (like attention, expectation, or the therapeutic encounter). Researchers pooled 54 randomized placebo-controlled trials (3,793 participants) out of 68 studies identified (5,238 participants total) covering mobilization, manipulation, exercise therapy, taping, and dry needling, comparing them to manual or nonmanual placebo interventions. They calculated the proportion of overall treatment effect not attributable to specific effects (PCE). For pain intensity, mobilization's PCE was 88% (95% CI: 0.57, 1.20), meaning most of its immediate effect wasn't from the specific technique; exercise therapy's PCE was lower at 46% (95% CI: 0.41, 0.52).

Manipulation showed a high PCE for short-term relief (81%), and mobilization for long-term effects (86%). Taping's PCE for disability was 64%. Confidence intervals were often wide, indicating uncertainty in these estimates.

This review looked at what actually drives improvement when people receive physical therapy for musculoskeletal pain, like joint mobilization, manipulation, exercise, taping, or dry needling. Researchers combined results from 54 studies (3,793 participants, drawn from 68 studies totaling 5,238 people) that compared real treatments to placebo treatments (like sham manual therapy). They found that a large portion of the benefit people experience isn't necessarily from the specific technique itself.

For mobilization, an estimated 88% of the immediate pain-relief effect wasn't attributable to the specific treatment, though this estimate had a wide range of uncertainty. Exercise therapy showed a smaller such proportion, 46%.

Manipulation showed this pattern strongly for short-term relief, and mobilization for longer-term effects. Taping showed a similar pattern for disability improvement. This doesn't mean these treatments don't help.

It means the reasons people feel better may extend beyond the mechanical or specific action of the treatment. The wide confidence intervals in several estimates suggest these numbers aren't precise, and no safety information was reported in this analysis.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This systematic review and meta-analysis pooled 54 placebo-controlled RCTs (n=3,793) from a larger set of 68 included studies (n=5,238) to estimate the proportion of physical therapy's effect not attributable to specific treatment effects (PCE) across musculoskeletal pain interventions. Risk of bias was assessed with RoB 2, and pooling used the Hartung-Knapp-Sidik-Jonkman random-effects method. Key estimates: mobilization's PCE for immediate pain intensity was 88% (95% CI: 0.57, 1.20), exercise therapy's was 46% (95% CI: 0.41, 0.52), manipulation excelled for short-term pain relief (PCE 81%, 95% CI: 0.62, 1.01), mobilization for long-term effects (PCE 86%, 95% CI: 0.76, 0.96), and taping for disability (PCE 64%, 95% CI: 0.48, 0.80).

Several confidence intervals are wide, some crossing or approaching 1.0, reflecting substantial estimation uncertainty rather than a precise, fixed proportion. The abstract does not detail heterogeneity statistics or overall certainty ratings, so caution is warranted before treating these PCE values as fixed benchmarks. The findings raise questions about the relative contribution of contextual factors across modalities, but the wide intervals and reliance on placebo-comparison trial designs mean these estimates should be interpreted as provisional rather than definitive.