Effectiveness of the physiotherapy interventions on complex regional pain syndrome in patients with stroke: A systematic review and meta-analysis.

Shoulder pain after stroke is common, and one particular pattern, complex regional pain syndrome, involves persistent pain along with sensory, motor, and autonomic changes in the affected hand or arm. This review asked what physiotherapy approaches have actually been tested for this condition and whether they help. The authors searched the literature through March 2021 and found only four randomized controlled trials suitable for pooling, covering interventions such as mirror therapy, laser therapy, and fluidotherapy compared with control treatments.

Pooling these trials suggested improvements in pain intensity and functional independence favoring the physiotherapy interventions. What makes this interesting is that CRPS after stroke is described as common yet strikingly understudied, so even a small pooled result offers some signal where little existed before. The main limitation is substantial: only four trials were available, and the statistical heterogeneity across them was extremely high, meaning the studies varied a great deal in how they were conducted or in their results, which weakens confidence in the pooled estimates.

If you or someone you know has had a stroke, shoulder or hand pain afterward is a common experience, and sometimes this pain comes with swelling, temperature changes, or stiffness, a pattern doctors call complex regional pain syndrome. This review looked at what physiotherapy treatments have been studied for this specific problem, including approaches like mirror therapy, laser therapy, and warm-water hand treatments called fluidotherapy. The researchers found only four small trials that could be combined, and when pooled, these treatments appeared to reduce pain and improve daily functioning compared to control treatments.

That's a hopeful signal, but it comes with an important caveat: there were very few studies, and they differed a lot from one another, which makes the combined result less certain than it might first appear. The review's broader message is that this painful and disabling condition after stroke has not received much research attention, and the authors call for more studies to build a clearer picture of what actually helps.

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 identified only four randomized controlled trials evaluating physiotherapy interventions, including mirror therapy, laser therapy, and fluidotherapy, for complex regional pain syndrome following stroke, out of 389 initially screened studies from PubMed and Google Scholar through March 2021. Pooled analysis using RevMan 5.4 found a large standardized mean difference favoring intervention over control for pain intensity (SMD 4.13, 95% CI 3.51 to 4.74) and functional independence (SMD 2.07, 95% CI 1.45 to 2.70). However, heterogeneity was extremely high for both outcomes (I2 = 99% and 100% respectively), which substantially undermines confidence in these pooled effect sizes and suggests considerable clinical or methodological variability across the four trials, such as differences in intervention protocols, outcome measurement, or patient populations.

The abstract does not report risk-of-bias assessment details or head-to-head comparisons between the different interventions, so it cannot be determined whether one modality outperformed another. Given the very small number of included trials and the extreme heterogeneity, these findings should be interpreted as preliminary rather than a settled evidence base, and the authors themselves note that this condition remains understudied clinically.