I had a similar situation with intense pain and was still using a walker 5 years after THA for a tumor in my hip joint. Finally found a doctor who put me on Fosamax once a week for three years. His xray showed the long stem of my implant ending at a angle where it rubbed directly on bone. His theory was to change my bone density to accept the prosthesis. It worked!! It's been 8 years since I stopped the Fosamax. No problem, but still need to keep stretching, walking and moving.