Rotaflex total knee arthroplasty: a report of two prosthetic failures at the hinge mechanism

We present two cases of Rotaflex hinged total knee arthroplasties in which the components forming the hinge mechanism have fractured. In one case this was the high density polyethelene sleeve bush of the tibial bearing, the other case being the titanium retaining peg of the tibial component. Component failure in this design of prosthesis is previously unreported.