Hi Laura,

Gluteus Medius is a stability muscle rather than a power muscle. I would be wary of the fact that you have torn it. When this happened did you have any bruising?

Firstly I would go to the physio. I would get the Wikipedia reference-linksacroiliac joint checked out as well as the hip. The sacroiliac joint is affected by impact activities e.g.running, and when it becomes inflamed the gluteal muscles tighten up as a protective measure.

I wouldn't advise running at the moment, but non-impact activities should be no problem.

I also agree with Yarok, in that it would be interesting to check if your past achilles injuries are linked in any way to this.