Effects of three types of resistance training on knee osteoarthritis: A systematic review and network meta-analysis.

Resistance training is widely recommended for knee osteoarthritis, but guidelines rarely specify which type of strengthening exercise works best. This network meta-analysis pooled randomised trials comparing three resistance training approaches, isometric, isokinetic and isotonic muscle strengthening, against conventional rehabilitation or physiotherapy, looking at pain, knee function and quadriceps strength. Across the pooled evidence, all three resistance training types improved pain and function compared with conventional rehabilitation, but isokinetic training, done on specialized equipment that controls movement speed, showed the largest improvements in pain, function and knee extension strength compared with usual physiotherapy. The analysis does not establish whether isokinetic training directly outperformed the other two resistance methods head-to-head, since most comparisons were each made against the control group rather than against each other.

As with any network meta-analysis, confidence depends on the quality and consistency of the underlying trials, which the abstract does not detail in full.

If you have knee osteoarthritis, you have probably heard that strengthening exercises can help, but there are different ways to do resistance training, and it has not been clear which type helps most. This research pooled results from multiple studies comparing three approaches, exercises done against a fixed resistance, exercises using speed-controlled equipment, and exercises using free movement against weight, all compared with standard physiotherapy care. The pooled evidence showed that all three approaches reduced pain and improved knee function compared to standard physiotherapy.

The speed-controlled equipment approach showed the strongest results for pain relief, function and knee muscle strength in these comparisons. It is not clear from this analysis whether this approach was actually better than the other two training types when tested directly against each other, since most studies compared each method separately to usual care rather than comparing the exercise types directly.

The strength of this conclusion also depends on the quality of the individual studies included, which isn't fully described here.

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

This network meta-analysis addresses a practical clinical question: when recommending resistance training for knee osteoarthritis, does the type of strengthening exercise matter? The authors pooled randomised trials comparing isometric, isokinetic and isotonic muscle strengthening protocols against conventional rehabilitation or physiotherapy, assessing pain, knee function and quadriceps strength (via knee extension torque). Isokinetic muscle strengthening, performed on speed-controlled equipment, produced the largest improvements versus conventional care across all three outcomes (pain MD -1.33, function MD -12.24, knee extension torque SMD -0.44), with all three resistance training types showing benefit over conventional rehabilitation for pain and function. Because the network structure relies predominantly on comparisons against a common control rather than direct head-to-head trials between resistance training types, the ranking of isokinetic training as superior should be interpreted as an indirect comparison rather than confirmed superiority from direct trials. The abstract does not report heterogeneity statistics, risk-of-bias findings, or participant counts, which limits assessment of how much confidence this ranking deserves.

Clinically, this informs discussions about resistance training modality selection but does not establish that isokinetic equipment, often requiring specialized apparatus, is necessary for meaningful improvement over other accessible forms of strengthening exercise.