Grannyhippy, I had a right THR a year ago and have a severe gluteus medius tear that requires surgical repair. It was seen on a MARS MRI by my second opinion surgeon, but I suspected it before because I am unable to balance alone on my surgical leg, and the gluteus medius and gluteus minimus function to hold the hip steady while on one leg, as in walking or running. I have never been able to balance on the surgical leg since THR and have always had a very bad limp, so I've been using either a walker or crutch this whole time since the op. I am scheduled for repair on August 15, but that date is in question because now I am having back problems that may require postponement. I'll keep you posted on how the surgery goes, whenever it goes. I also have pain in my hip area and butt, mostly aching, but sometimes more sharp and piercing. Sometimes the leg "catches" and gives way, but since I am always using a walking aid, the consequences aren't too bad from that.
This is an often underdiagnosed problem. My original surgeon had no idea what was wrong with me, even when I presented him with the evidence I had gathered about a possible glute tear. He insisted it couldn't tear, and certainly surgery would never be required to fix it (if it couldn't tear). Little did he know. I will have two other surgeons working on my hip. one who specializes in glute repairs and has pioneered surgical techniques. The other to do exploratory surgery.
Good luck with this. I had an orthopedic surgeon and two radiologists who missed the diagnosis completely, even when faced with the MRI proof in front of their faces. They didn't know what to look for. All my best wishes to you,
@Grannyhippy!