I Have Had Pain In My Right Buttocks For About

I have had pain in my right buttocks for about 8 weeks. I have gone go my MD after about 6 weeks of the pain and I couldn't put weight on my right leg. I have had the pain also on my left side but now it is on the right. I have had a right hip replacement several years ago and the pain that went down my leg left and I felt great. Now 3 yrs later I have this problem. I was given predisone for a week and that didn't really help