Hip joint prosthesis

摘要

A prosthetic hip joint for use in the replacement of at least a portion of defective hip joint. The hip joint includes a femoral component and an acetabular component. The femoral component includes a stem that has an uninterrupted outer surface and is continuously tapered from the proximal end of the stem to the distal end. The stem is oval shaped in cross-section with the longer axis of the oval being in the lateral-medial plane and the shorter axis being in the anterior-posterior plane. The neck portion of the device in cross-section is narrower in its anterior-posterior dimension than its lateral-medial dimension. The femoral component is available with different length neck portions to allow the tightness of the hip joint to be varied. However, even when the length of the neck portion is varied, the distance between the center of the head and the longitudinal axis of the stem and the curvature of the stem are not varied. The acetabular component has a body of constant thickness from its socket surface to the exterior surface and there are spaced rings projecting outwardly from the exterior surface.