Comparison of polyethylene wear in anatomical and reversed shoulder prosthesesReport as inadecuate




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Published in: Journal of Bone and Joint Surgery [Br], vol. 91-B, num. 7, p. 977-982 Publication date: 2009

Wear of polyethylene is associated with aseptic loosening of orthopaedic implants and has been observed in hip and knee prostheses and anatomical implants for the shoulder. The reversed shoulder prostheses have not been assessed as yet. We investigated the volumetric polyethylene wear of the reversed and anatomical Aequalis shoulder prostheses using a mathematical musculoskeletal model. Movement and joint stability were achieved by EMG-controlled activation of the muscles. A non-constant wear factor was considered. Simulated activities of daily living were estimated from in vivo recorded data. After one year of use, the volumetric wear was 8.4 mm3 for the anatomical prosthesis, but 44.6 mm3 for the reversed version. For the anatomical prosthesis the predictions for contact pressure and wear were consistent with biomechanical and clinical data. The abrasive wear of the polyethylene in reversed prostheses should not be underestimated, and further analysis, both experimental and clinical, is required.

Keywords: Molecular-Weight Polyethylene ; Retrieved Glenoid Components ; Total Hip-Arthroplasty ; Humerus Translation ; Contact Stress ; Joint ; Particles ; Debris ; Replacement ; Osteolysis Reference LBO-ARTICLE-2009-004doi:10.1302/0301-620X.91B7.21999View record in Web of Science





Author: Terrier, Alexandre; Merlini, Francesco; Pioletti, Dominique P.; Farron, Alain

Source: https://infoscience.epfl.ch/record/138725?ln=en



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