Movement loci of selected points on the femoral head for individual total hip arthroplasty patients using three-dimensional computer simulation

Bennett, D; Orr, JF; Baker, RJ

Abstract

Wear of ultra-high-molecular-weight polyethylene (UHMWPE) and the subsequent adverse tissue reaction to the wear particles has been cited as the predominant problem affecting total joint arthroplasties. Wear of the UHMWPE
acetabular cup in total hip arthroplasties (THAs) is influenced by the sliding distance and direction of individual points on the femoral head, which has as yet been
ascertained only for normal subjects. This study seeks to determine the trajectory of specified points on the femoral head for individual THA patients and the distances
traversed by these points. A computer program was designed to use gait data from THA patients to simulate the motion of these points. Gait analysis was performed on
19 THA patients at a period of 5 years after operation. The orientation of the acetabular cup was ascertained from radiographs to determine the position of the
points on the head most involved in the wear process. The loci of the points differed widely in size, shape, and direction between subjects. The largest average distance
traversed was 140% greater than the smallest average distance traversed. Shorter longitudinal paths would tend to cause less wear than larger, wider paths, which cross
a greater number of adjacent paths.

Citation

Bennett, D., Orr, J., & Baker, R. (2000). Movement loci of selected points on the femoral head for individual total hip arthroplasty patients using three-dimensional computer simulation. Journal of Arthroplasty, 15(7), 909-915. https://doi.org/10.1054/arth.2000.9195

• Journal Article Type: Article
• Publication Date: Jan 1, 2000
• Deposit Date: Jul 7, 2011
• Journal: The Journal of Arthroplasty
• Print ISSN: 0883-5403
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 15
• Issue: 7
• Pages: 909-915
• DOI: https://doi.org/10.1054/arth.2000.9195
• Publisher URL: http://dx.doi.org/10.1054/arth.2000.9195