Arthrodesis of a painful hip with the prosthesis still in situ was achieved after bilateral hip arthroplasty. The arthrodesis was performed at one time, placing three massive bone grafts anterior, superior, and postero-inferior to the prosthesis. Thus, the length of the extremity was preserved, and the optimum position of the hip could be achieved. This procedure is formidable, but is believed to have more advantages than disadvantages in selected cases.