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Dislocation following total hip replacement surgery represents a significant cause of early failure, incurring additional medical costs and patient distress. One major cause of dislocation is implant impingement. The most important factor in preventing implant impingement is correct implant orientation. This paper describes the newest version of a prosthetic range of motion simulator which permits prediction of prosthetic range of motion for non-axisymmetric femoral and acetabular implants. This analytical methodology could be used as a preoperative simulation tool that can help surgeons decide the implant placement that reduces the chance of implant impingement. Coupled with a computer-assisted clinical system for precise implant positioning, this approach could significantly reduce the risk of dislocation, maximize the “safe” range of motion, and minimize the risk for complications arising from impingement.

Range of motion after total hip arthroplasty: Simulation of non-axisymmetric implants