脱臼防止機構付き人工股関節におけるインピンジメント発生時の力学的挙動

抄録

An effective treatment for hip osteoarthritic patients is total hip arthroplasty (THA). THA is a surgical procedure in which a painful osteoarthritic hip joint is replaced with an artificial hip joint. Joint dislocation is one of the most critical problems not only for human but also for canine THA. We have newly proposed an artificial hip joint which has a simple structure to prevent joint dislocation. The proposed joint has the structure with a femoral head partially covered with an acetabular cup. In the present study, the dislocation moment due to the impingement was assessed using finite element analysis. The dislocation moment was approximately 415, 166, and 8 N•mm in the case of the 1.5, 1.0, and 0.5 mm inset height model, respectively. This result indicates that the acetabular cup with the structure for preventing dislocation has an ability to resist the excess rotational movement which induces joint impingement.