Centraliser

摘要

A centraliser (1) is provided for a femoral stem prosthesis (2) for implantation in a patient's femur in hip replacement surgery. The centraliser (1) has an elongated ring body (14) with an internal surface (22) with a convex curvature. The convex curvature ensures that a point or ring contact is made with the surface of the femoral stem (2) in an area where the material thickness of the centraliser (1) reduces the effect of hoop loading. The centraliser (1) has a generally rectangular cross section with four fins (22) extending from the sides (30) of the rectangular cross section for location on the anterior, posterior, medial and lateral faces of the bone cavity.