I have inconsistent bone pain in my left femur, hip, and knee. Some days it's debilitating, other days barely noticeable. I am always lame and my left leg feels longer than my right, distorting my walk stride unless I concentrate. I am nearly 60 yrs old, but very fit horse riding and walking dogs daily. I generally have to do about 4 hrs hard physical work each day. I take Naproxen to help the pain. Can you advise please?