Reverse total shoulder arthroplasty (RSA) serves as an effective alternative to total shoulder arthroplasty (TSA), especially for patients with rotator cuff deficiency . Long-term performance of RSA has been limited by a variety of complications including dislocation, infection, humeral fracture, glenoid loosening, glenoid unscrewing, scapular erosion and polyethylene debris [1–2]. Dissociation between the proximal metaphyseal component and distal humeral prosthetic stem (disaphysis) in modular RSAs has been reported with low frequency (1–2%) ; however, cases have led to severe consequences including in vivo disassembly . Most cases of unscrewing have occurred due to insufficient support for the prosthesis resulting from proximal humeral bone deficiency [4–5]. In this study, we evaluate a retrieved RSA that unscrewed and subsequently fractured in vivo in a patient with proximal bone deficiency.
- Bioengineering Division
Design Analysis: Modular Reverse Total Shoulder Prosthetic Failure Without Proximal Bone Support
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Ansari, F, Major, C, Gunther, SB, Norris, TR, Ries, M, & Pruitt, L. "Design Analysis: Modular Reverse Total Shoulder Prosthetic Failure Without Proximal Bone Support." Proceedings of the ASME 2013 Summer Bioengineering Conference. Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments. Sunriver, Oregon, USA. June 26–29, 2013. V01AT20A014. ASME. https://doi.org/10.1115/SBC2013-14293
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