title: The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners.
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.
authors.affiliation: Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory, University Medicine Rostock, Rostock, Germany.
authors.forename: Carmen
authors.initials: C
authors.lastname: Zietz
authors.affiliation: Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory, University Medicine Rostock, Rostock, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Fabry
authors.affiliation: Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory, University Medicine Rostock, Rostock, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Baum
authors.affiliation: Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory, University Medicine Rostock, Rostock, Germany.
authors.forename: Rainer
authors.initials: R
authors.lastname: Bader
authors.affiliation: Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory, University Medicine Rostock, Rostock, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Kluess
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods; D001672:Biocompatible Materials; D002516:Ceramics; D020342:Finite Element Analysis; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008422:Materials Testing; D008954:Models, Biological; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013314:Stress, Mechanical
chemical_list: D001672:Biocompatible Materials; D020959:Polyethylene
keywords: cross-linked polyethylene; finite element analysis; hip replacement; implant position; wear