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Hitchon S, Soltanmohammadi P, Milner JS, Holdsworth D, Willing R. Porous versus solid shoulder implants in humeri of different bone densities: A finite element analysis. J Orthop Res 2024. [PMID: 38520665 DOI: 10.1002/jor.25840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 03/09/2024] [Accepted: 03/12/2024] [Indexed: 03/25/2024]
Abstract
Porous metallic prosthesis components can now be manufactured using additive manufacturing techniques, and may prove beneficial for promoting bony ingrowth, for accommodating drug delivery systems, and for reducing stress shielding. Using finite element modeling techniques, 36 scenarios (three porous stems, three bone densities, and four held arm positions) were analysed to assess the viability of porous humeral stems for use in total shoulder arthroplasty, and their resulting mechanobiological impact on the surrounding humerus bone. All three porous stems were predicted to experience stresses below the yield strength of Ti6Al4V (880 MPa) and to be capable of withstanding more than 10 million cycles of each loading scenario before failure. There was an indication that within an 80 mm region of the proximal humerus, there would be a reduction in bone resorption as stem porosity increased. Overall, this study shows promise that these porous structures are mechanically viable for incorporation into permanent shoulder prostheses to combat orthopedic infections.
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Affiliation(s)
- Sydney Hitchon
- School of Biomedical Engineering, Western University, London, Ontario, Canada
- Bone and Joint Institute, Western University, London, Ontario, Canada
| | | | - Jaques S Milner
- Robarts Research Institute, Western University, London, Ontario, Canada
| | - David Holdsworth
- Bone and Joint Institute, Western University, London, Ontario, Canada
- Robarts Research Institute, Western University, London, Ontario, Canada
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Ryan Willing
- School of Biomedical Engineering, Western University, London, Ontario, Canada
- Bone and Joint Institute, Western University, London, Ontario, Canada
- Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada
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