Effects of manual lymphatic drainage on total knee replacement: a systematic review and meta-analysis of randomized controlled trials.

After a total knee replacement, swelling, pain, and stiffness are common challenges, and manual lymphatic drainage, a gentle massage technique aimed at moving fluid through the lymphatic system, has been proposed as a way to ease recovery. This review pooled results from 7 randomized controlled trials involving 285 patients to see whether adding manual lymphatic drainage made a measurable difference compared with not using it or using another physiotherapy approach. Across the outcomes examined, knee bending and straightening range of motion, leg swelling, and pain, no statistically significant differences emerged between the groups that received manual lymphatic drainage and those that did not. The authors conclude that current trial evidence does not support recommending it for knee replacement rehabilitation.

The main limitation is that this conclusion rests on a relatively small number of trials and patients, and the certainty of the underlying evidence was assessed using the GRADE framework, suggesting caution in interpreting these null results as definitive proof of no effect at all.

If you have had or are considering a knee replacement, you may have heard about manual lymphatic drainage, a hands-on massage technique meant to help reduce swelling and ease recovery. Researchers wanted to know whether adding this therapy actually helps compared with standard care or other physiotherapy approaches. Looking across 7 small randomized trials with a total of 285 patients, the researchers found no clear difference between people who received manual lymphatic drainage and those who didn't, in terms of knee bending and straightening movement, leg swelling, or pain levels after surgery.

This doesn't necessarily mean the therapy has zero effect, but the evidence currently available does not show a clear benefit. Because this analysis combines a fairly small number of studies, the findings should be viewed as a modest body of evidence rather than a definitive answer. The researchers concluded that, based on what trials have shown so far, manual lymphatic drainage cannot be recommended as part of knee replacement recovery.

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 addresses whether manual lymphatic drainage, when compared with no such treatment or an alternative physiotherapy approach, measurably improves recovery outcomes after total knee replacement, specifically range of motion, limb swelling, and pain. Pooling 7 randomized controlled trials with 285 patients, none of the four outcomes assessed reached statistical significance: knee flexion (SMD 0.03, 95% CI -0.22 to 0.28, P=0.812), knee extension (SMD -0.30, 95% CI -0.64 to 0.04, P=0.084), lower extremity circumference as a proxy for swelling (SMD -0.09, 95% CI -0.27 to 0.09, P=0.324), and postoperative pain (SMD -0.33, 95% CI -0.71 to 0.04, P=0.083). For clinical reasoning, this tells us that current trial-level evidence does not demonstrate a statistically significant advantage for manual lymphatic drainage over comparison treatments on any of these four outcomes, rather than proving the intervention has no effect whatsoever.

The confidence intervals for extension and pain trend toward benefit without crossing the threshold for significance, and should be read as non-significant trends rather than near-misses supporting use. The authors applied GRADE to rate certainty of evidence, and the pooled analysis rests on only 7 trials, limiting precision and the ability to detect smaller true effects. The abstract does not report adverse events, so no safety conclusions can be drawn, and whether specific patient subgroups or MLD techniques might respond differently is not addressed.