The anterior glut med fibres, tfl, parts of glut min act as secondary movers for internal rotation I believe. I don't think there are any primary internal rotators, just secondary actions from the above muscles, adductors, semimem/tendinosis... ?? Will go look it up later on.

Trochanctric bursitis involves release of TFL/Gluts and ITB w/ a change in aggravating activities anyway... Just add anti-inflams into the mix (talk to your pharmacist).