Early and late failure as a result of scetabular component loosening are on the increase, and at the times the iatrogenic insufficiency of acetabular bone makes restoring a functional hip a very difficult problem. The bipolar prosthesis is on alternative that can be used in those selected circumstances in which hip arthroplasty offers the optimum opportunity for maximum rehabilitation. During the revision of previous hip replacements the acetabulum became huge and thin flexible walls, and massive bone graft was required. So authors used a big head bipolar(60mm) where the acetabulum was huge with big flexible walls and massive bone graft was required. The study was comprised of 15 patients with a follow-up 2 to 8 years. The results were as follows;l. One case had to be revised at 4 years because of stem sinkage. At the revision the acetabulum was found to be recovered to such an extent that it was impossible to insert a threaded cup. 2. Apart from the two non-walkers, 4 patients were Trendelenburg positive although several still limp when they were tired. 3. Two patients had groin pain. 4. Acetabular migration had not been noted in any case.