Running related gluteus medius function in health and injury: A systematic review with meta-analysis.

Runners often develop injuries linked to poor control of the pelvis from side to side, and one muscle thought to help steady the pelvis is the gluteus medius, a hip muscle on the side of the buttock. This systematic review pulled together thirteen studies that used electromyography, a method that records muscle electrical activity, to look at how this muscle behaves during running in healthy people and in runners with injuries. The review found that gluteus medius activity typically peaks once during the loading phase of each stride, that its activity increases as running speed increases (more clearly in women), and that in people with patellofemoral pain syndrome (pain around the kneecap), the muscle stays active for a shorter duration than in uninjured runners, a moderate and statistically significant difference. Evidence on Achilles tendinopathy was more limited.

The authors suggest this dysfunction might potentially be addressed through running retraining, though this review did not test that idea; the evidence base for each specific finding rests on only a handful of small studies.

If you run and have dealt with knee pain around the kneecap (called patellofemoral pain syndrome) or Achilles tendon issues, you might wonder whether a particular hip muscle plays a role. This review looked at past studies measuring the electrical activity of the gluteus medius, a muscle on the side of your hip, while people ran. Researchers found that in healthy runners, this muscle typically switches on once per stride, right as the foot lands and takes weight, and becomes more active as running speed increases, especially in women.

In runners with kneecap pain, the muscle stayed switched on for a shorter time than in runners without pain, a difference the researchers considered meaningful. Fewer studies looked at Achilles tendon pain, so less is known there. It's worth understanding that this comes from a small collection of studies, not a large trial, and showing a muscle timing difference doesn't prove it causes the pain or that changing how the muscle fires would fix it.

The authors raise running retraining as a possible way to address this, but that wasn't tested here.

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

This review addresses a recurring clinical question: when runners present with patellofemoral pain or Achilles tendinopathy and clinicians suspect a frontal-plane pelvic control deficit, is there electromyographic evidence implicating gluteus medius dysfunction? Pooling thirteen studies, the authors describe a consistent mono-phasic gluteus medius activity profile in healthy runners, peaking at initial loading, with amplitude rising alongside running speed, a pattern most apparent in female runners. This speed-amplitude relationship and the sex difference are useful context when interpreting EMG findings in runners, though both rest on a limited number of included studies. The clinically relevant comparison, between injured and uninjured runners, rested on only two studies for Achilles tendinopathy and three for patellofemoral pain syndrome.

The patellofemoral pain finding, a moderate and statistically significant reduction in gluteus medius activation duration, is the review's most robust result, but it remains an association from observational comparisons rather than evidence that altered gluteus medius timing causes the pain or that modifying it changes outcomes. The authors' suggestion that running retraining could address this dysfunction is speculative and was not evaluated in any included study, so this review does not establish a basis for selecting or prioritising a specific retraining intervention.