This is a benign clinical condition wherein lining of the hip joint produces abnormal nodules (swelling) within the joint. This is not a cancer. The patients usually present with painful hip joint. The diagnosis is usually made by MRI scans. The treatment in early stages involves removal of all the nodules and the lining of the joint (synovectomy). This can be done by key hole surgery (arthroscopy) or open surgery depending upon the degree of involvement. If there are significant arthritic changes in the joint, the patients will benefit from joint replacement.