title: The effect of stem geometry on stresses within the distal cement mantle in total hip replacement.
abstract: Cement-stem debonding is one of the most common reasons for failure in Total Hip Replacement (THR). Four similar THR prostheses design configurations were investigated with reference to the influence of mechanical stress occurring in a cement mantle of differing thicknesses and potentially affecting clinical performance. Non-linear finite element analysis was performed on constant cement mantle thicknesses of 1, 2, and 4 millimetres. The results obtained indicate stress levels within the cement mantle decrease with increasing cement mantle thickness. The prosthesis distal tip is shown to have particular significance. Truncation of the distal tip hemisphere to a flat profile for the fixation of a centralizer increases the cement stresses.
authors.affiliation: Department of Engineering, Glasgow Caledonian University, Scotland, UK. wsh@gcal.ac.uk
authors.forename: W
authors.initials: W
authors.lastname: Schmölz
authors.forename: D R
authors.initials: DR
authors.lastname: Gordon
authors.forename: A J
authors.initials: AJ
authors.lastname: Shields
authors.forename: D
authors.initials: D
authors.lastname: Kirkwood
authors.forename: P
authors.initials: P
authors.lastname: Grigoris
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001843:Bone Cements; D006622:Hip Prosthesis; D006801:Humans; D011475:Prosthesis Failure; D013314:Stress, Mechanical
chemical_list: D001843:Bone Cements