[Exchange of endoprosthesis using a proximal femur resection prosthesis]

Total hip arthroplasty (THA) with the use of a Mega prosthesis was performed on 24 patients with significant loss of bone stock in revision THA. A clinical and radiological examination was carried out according to the Enneking evaluation scheme on average 7 years after THA. Pain, active hip motion and strength of hip muscles, walking ability, and activities of daily living rated excellent or good and compared well with the results following conventional THA. Limp and positive Trendelenburg sign were common to all except one after Mega prosthesis implantation and were independent on the type of refixation of the hip abductors. Dislocation of the prosthesis occurred in 16.6% of cases and depended on the type of cup implanted. Remarkable was a periprosthetic callus formation surrounding the stem of the femoral implant.