Journal article
Biomechanical Comparison of 2 Proximally Coated Femoral Stems Effects of Stem Length and Surface Finish
The Journal of arthroplasty, v 24(5), pp 819-824
01 Aug 2009
PMID: 18977636
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Proximally hydroxyapatite-coated stems have performed well clinically but produced moderate proximal stress shielding and midstem cancellous condensation. Stem modification (stem shortening and distal tip polishing) has resulted in greater incidence of thigh pain. We performed a retrospective finite element analysis of the effects of stem length and surface finish to determine if midstem fixation could be avoided and the results could relate to the clinical outcomes. The modified short stein not only produced moderately less proximal bone resorption but also exhibited greater instability with 40% to 94% greater bone-implant relative motion at the stem tip. Bone formation potential at the transition between the coated and uncoated regions of both stems was observed based on changes in strain energy density. These findings are consistent with previous radiographic and clinical comparisons of short- and long-stem designs. Increased pain incidence for short-stem patients may be related to decreased implant instability and increased interface relative motion.
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Details
- Title
- Biomechanical Comparison of 2 Proximally Coated Femoral Stems Effects of Stem Length and Surface Finish
- Creators
- Kevin L. Ong - Exponent (United States)Judd S. Day - ExponentMichael T. Manley - StrykerSteven M. Kurtz - Exponent (United States)Rudolph Geesink - Univ Hosp Maastricht, Maastricht, Netherlands
- Publication Details
- The Journal of arthroplasty, v 24(5), pp 819-824
- Publisher
- Elsevier
- Number of pages
- 6
- Grant note
- Homer Stryker Center for Orthopaedic Education and Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Medicine; School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000269404200024
- Scopus ID
- 2-s2.0-67650711351
- Other Identifier
- 991019167431104721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Orthopedics