Journal article
Edge-loading severity as a function of cup lip radius in metal-on-metal total hipsuA finite element analysis
Journal of orthopaedic research, Vol.30(2), pp.169-177
02/01/2012
DOI: 10.1002/jor.21524
PMCID: PMC5160130
PMID: 21812025
Abstract
While favorable tribological properties and allowance for larger femoral head sizes have made metal-on-metal (MoM) bearings an increasingly popular choice for total hip arthroplasty, concerns have mounted regarding adverse reactions to metal wear debris and ions. MoM cups differ from conventional polyethylene cups in terms of edge profile design and reductions from full hemisphericity, suggesting differences in loading at or near the cup edge, especially during subluxation events. Finite element analysis was used to investigate the effects of cup orientation and lip edge curvature on damage propensity for edge or near-edge loading during subluxation. Increased cup lip radius (resulting in reduced articular arc) had a detrimental effect upon subluxation-free hip range of motion and upon dislocation resistance. Contact stresses near the cup edge demonstrated complex relationships between edge radius and cup orientation, with peak stresses being influenced by both variables. The tendency for scraping wear at the egress site demonstrated similarly complex dependencies. These data indicate that acetabular cup design is an important determinant of edge and near-edge loading damage propensity. (C) 2011 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 30:169177, 2012
Details
- Title: Subtitle
- Edge-loading severity as a function of cup lip radius in metal-on-metal total hipsuA finite element analysis
- Creators
- Jacob M. Elkins - University of IowaKaren M. Kruger - University of IowaDouglas R. Pedersen - University of IowaJohn J. Callaghan - University of IowaThomas D. Brown - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of orthopaedic research, Vol.30(2), pp.169-177
- DOI
- 10.1002/jor.21524
- PMID
- 21812025
- PMCID
- PMC5160130
- NLM abbreviation
- J Orthop Res
- ISSN
- 0736-0266
- eISSN
- 1554-527X
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- Veterans Administration; US Department of Veterans Affairs AR46601; AR53553 / NIH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA T32GM007337 / NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of General Medical Sciences (NIGMS) R24AR046601 / NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Arthritis & Musculoskeletal & Skin Diseases (NIAMS)
- Language
- English
- Date published
- 02/01/2012
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Orthopedics and Rehabilitation
- Record Identifier
- 9984303980102771
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