The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners.
biomechanical · Level V
Where this comes from
- Record sourced from PubMed, PMID 25770865.
- Also identified by DOI 10.1016/j.arth.2015.02.025.
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Abstract
The aim of the present wear simulator study was to assess the effect of steep acetabular cup positions on the wear propagation of highly cross-linked-PE (HX-PE) liners. Furthermore, a finite element analysis (FEA) was performed in order to calculate the stress within the HX-PE material in case of steep cup positions under physiological loadings. The higher stress in the HX-PE at a steep acetabular cup position did not result in increased wear in the present wear simulator study. The gravimetrical wear rates at normal (45°) and steep cup inclinations (75°) showed wear amounts of 3.15±0.27mg and 2.18±0.31mg per million cycles (p=0.028), respectively. However, FEA revealed clear increase in stress at the HX-PE liners with respect to steep cup positions.
Medical subject headings
- Acetabulum
- Biocompatible Materials
- Ceramics
- Hip Prosthesis
- Polyethylene
- Prosthesis Failure
Anatomy
- hip