title: A hip joint simulator study using simplified loading and motion cycles generating physiological wear paths and rates.
abstract: In some designs of hip joint simulator the cost of building a highly complex machine has been offset with the requirement for a large number of test stations. The application of the wear results generated by these machines depends on their ability to reproduce physiological wear rates and processes. In this study a hip joint simulator has been shown to reproduce physiological wear using only one load vector and two degrees of motion with simplified input cycles. The actual path of points on the femoral head relative to the acetabular cup were calculated and compared for physiological and simplified input cycles. The in vitro wear rates were found to be highly dependent on the shape of these paths and similarities could be drawn between the shape of the physiological paths and the simplified elliptical paths.
authors.affiliation: School of Mechanical Engineering, University of Leeds, UK.
authors.forename: P S
authors.initials: PS
authors.lastname: Barbour
authors.forename: M H
authors.initials: MH
authors.lastname: Stone
authors.forename: J
authors.initials: J
authors.lastname: Fisher
mesh_terms: D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D002858:Chromium Alloys; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing; D009038:Motion; D011095:Polyethylenes; D011475:Prosthesis Failure; D013193:Stainless Steel; D015040:Zirconium
chemical_list: D002858:Chromium Alloys; D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D013193:Stainless Steel; D015040:Zirconium; C028541:zirconium oxide