[Early aseptic loosening of cemented cup in metal-on-metal total hip arthroplasties].

Purpose Of The Study: The aim of this study was to report cases of acetabular failure of metal-on-metal total hip arthroplasties using cemented cups with a metal-metal bearing.

Material And Methods: From 1997 to 1999, 137 patients underwent total hip arthroplasty with a 28-mm head and a metal-metal (Metasul) bearing. At mean follow-up of three years eight months (range 2-6 years), three patients had died and thirteen were lost to follow-up or had less than 2 years follow-up.

[The cemented Müller straight stem total hip prosthesis with polyethylene cup and 28 mm head: ten-year results].

Purpose Of The Study: The purpose of this study was to evaluate the 10-year results of the cemented Müller straight stem total hip prosthesis with polyethylene cup and 28 mm head.

Material And Method: From May 1988 to May 1990, 187 cemented prostheses (second-generation technique) were implanted via a transgluteal approach for degenerative hip disease. A Protasul 10 straight stem with a 28 mm modular head and a gamma ray sterilized polyethylene cup was used in all cases.

Radiographic stereometry for non-metal-backed acetubular cups: 3D wear estimation and related uncertainty.

The aim of this work was to assess the 3D wear of non-metal-backed acetubular cups from two conventional digitized radiographs. The centers of the femoral head and the metal ring in the equatorial plane of the cup are located using 3D pose techniques for spheres and circles from sampled points in the images. The method used to locate these points of interest and also estimate their covariance is fully described in previous work.