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Type: Journal article
Title: Altered load transfer in the pelvis in the presence of periprosthetic osteolysis
Author: Munro, J.
Fernandez, J.
Millar, J.
Walker, C.
Howie, D.
Shim, V.
Citation: Journal of Biomechanical Engineering, 2014; 136(11):114502-1-114502-7
Publisher: American Society of Mechanical Engineers
Issue Date: 2014
ISSN: 0148-0731
Statement of
Jacob T. Munro1, Justin W. Fernandez, James S. Millar, Cameron G. Walker, Donald W. Howie and Vickie B. Shim
Abstract: Periprosthetic osteolysis in the retroacetabular region with cancellous bone loss is a recognized phenomenon in the long-term follow-up of total hip replacement. The effects on load transfer in the presence of defects are less well known. A validated, patient-specific, 3D finite element (FE) model of the pelvis was used to assess changes in load transfer associated with periprosthetic osteolysis adjacent to a cementless total hip arthroplasty (THA) component. The presence of a cancellous defect significantly increased (p < 0.05) von Mises stress in the cortical bone of the pelvis during walking and a fall onto the side. At loads consistent with single leg stance, this was still less than the predicted yield stress for cortical bone. During higher loads associated with a fall onto the side, highest stress concentrations occurred in the superior and inferior pubic rami and in the anterior column of the acetabulum with larger cancellous defects.
Keywords: Finite element model; subject specific; cementless acetabular component; pelvic bone; osteolysis
Rights: © 2014 ASME The American Society of Mechanical Engineers
DOI: 10.1115/1.4028522
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Mechanical Engineering publications

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