I dont know what THR. Sounds like YOU are in urgent need of an MRI from a new surgeon or perhaps your old surgeon. I do know from experience that once a surgeon does a surgery and the patient is not better, most surgeons would prefer to ref that patient out rather than deal with them or their problem - at least that's been my humble experience. Get the MRI on your hip. But Get several readings.. I had one MRI and with 3 people, 2 read something completely different....only greater trochanter bursistus rather than a severaly torn, retracted, and atrophied glute med. Good luck