Materials and Methods

omponent impingement due to poor positioning can limit range of motion after total hip arthroplasty. Contact stresses on ultra-high molecular weight poly-ethylene are also dependent on the orientation of the acetabu-lar component. In this study, a computer kinematic model was used to determine the effects of component position and vari-ation of head:neck ratios on prosthetic impingement and hip range of motion, and a finite element model was employed to calculate polyethylene stresses at different cup positions