“…Numerous authors have reported improvements in pain and function [2,9,10,13] and ROM [10,15] after the use of rotating-hinge prostheses. Despite these findings, major complication rates ranging from 0% to 44% at 3.8 to 15 years have been reported secondary to infection, aseptic loosening, patellar instability, and prosthetic dislocation [6,16]. Less common modes of failure also have been identified, including failure of the polyethylene bushing [20], fracture of the tibial metal post [18], fracture of the tibial yoke [8], failure of an antidislocation mechanism [12], and tibiofemoral distraction disengagement [21].…”