title: Problematic sites of third body embedment in polyethylene for total hip wear acceleration.
abstract: A computational model was developed to identify the sites of third body particle embedment in a total hip acetabular component surface that are most problematic in terms of roughening the overpassing regions of the femoral head counterface, leading in turn to most severely accelerated polyethylene wear. The analytical approach used was to calculate loci of acetabular sites that, during the gait cycle, overpass previously documented regions of kinetically most critical femoral head roughening. Instantaneous local contact stress and sliding distance were postulated as factors contributing to the severity of the femoral head scratching/roughening which would be expected, due to otherwise-similar particles embedded along each such acetabular overpass locus. The computational results showed that the location of debris embedment was a potent determinant of the amount of polyethylene wear acceleration expected. The data also showed that the supero-lateral aspect of the acetabular cup is consistently and by far the most problematic area for third body particle embedment.
authors.affiliation: Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Hannah J
authors.initials: HJ
authors.lastname: Lundberg
authors.forename: Kristofer J
authors.initials: KJ
authors.lastname: Stewart
authors.forename: Douglas R
authors.initials: DR
authors.lastname: Pedersen
authors.forename: John J
authors.initials: JJ
authors.lastname: Callaghan
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Brown
mesh_terms: D000077:Acetabulum / Q000503:physiopathology* / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods; D003198:Computer Simulation; D017076:Computer-Aided Design; D003627:Data Interpretation, Statistical; D004548:Elasticity; D019544:Equipment Failure Analysis / Q000379:methods*; D005270:Femur Head / Q000503:physiopathology* / Q000601:surgery; D020342:Finite Element Analysis; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000503:physiopathology*; D008390:Markov Chains; D008422:Materials Testing; D008954:Models, Biological; D009038:Motion; D020959:Polyethylene / Q000737:chemistry*; D011475:Prosthesis Failure; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D020959:Polyethylene