Experience of the Lord's Madreporique Total Hip System (The Cementless Way)

概要

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We have experienced 11 cases of Lord Madréporique total hip arthroplasty; its prosthesis constitutes an irregular rough surface created by multitude of small beads which provide retentive support for newly formed bone, without the need for surgical bone cement. Acetabular component consists of a metallic ring made of chromium-colbalt alloy and a polyethylene core. The ages of our cases were younger than those of Charnley's THR, ranging from 34 to 68 years with an average age of 53.9 years. The acetabula of our cases were nondysplastic or slightly damaged. The most important factors of the surgical techniques were to set the screw ring at 45 degrees of tilt and 10 degrees of anteversion, and to set the stem at 10 degrees of anteversion. In this series there were two cases of postoperative luxation which had more than 55 degrees of tilt of the screw ring, and two cases of fracture in the trochanteric region and femoral shaft.