A proximal femoral prosthesis minimizes impingement, thereby affording an enhanced range of motion as compared to existing devices. The central portion of the neck of a prosthesis according to the invention is oriented distally relative to a straight line drawn between the ball portion and a point of...http://www.google.com/patents/US6383225?utm_source=gb-gplus-sharePatent US6383225 - Anti-impingement hip system
