Coaxial ligamented hip prosthesis

Abstract

A hip prosthesis is disclosed herein intended to be fitted into a skeletal pelvis socket and which has a replacement socket that includes a metal semi-spherical acetabulum base with a plastic acetabulum liner for movably holding a spherical ball against the liner by a ligament rod. The rod passes through a head of a stem implanted into a femur and terminates with a ligament anchor plate fitted in the acetabulum base via an eyelet and pin connection. A tensioning nut is carried on the stem head in threadable connection with the rod. A conical cutout in the spherical ball permits movement of the ball with the apex of the cone at the center of the spherical ball under adjustable tensioning of the rod. A Wear compensation system is included by incorporating an open passageway in the base which communicates with a blister in the liner for accommodating the introduction of cement to compensate for wear. A boot of mesh material encloses portions of the base, liner and the ball.

Dependencies are inferred from the claim text.