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Influence of joint kinematics on polyethylene wear in anatomic shoulder joint arthroplasty.
- Source :
- Journal of Shoulder & Elbow Surgery; Sep2018, Vol. 27 Issue 9, p1679-1685, 7p
- Publication Year :
- 2018
-
Abstract
- Background Despite the positive results in total shoulder arthroplasties (TSAs), a higher revision rate is documented compared with total hip and knee replacements. Wear is the possible main cause of TSA failure in the long-term. This study investigated the effect of joint kinematics and the influence of the rotator cuff on the polyethylene wear performance in an anatomic TSA. Methods Lifting a load of 2 kg with an abduction/adduction of 0° to 90° was simulated for 2 × 10 6 cycles as a primary motion using a fully kinematic joint simulator. A combined rotation in anteversion-retroversion of ±5° and ±10° was also simulated. The force in the superior-inferior direction and the axial joint compression were applied under force control based on in vivo data of the shoulder. A soft tissue restraint model was used to simulate an intact and an insufficient rotator cuff. Results The highest wear rate in the intact rotator cuff group was 58.90 ± 1.20 mg/10 6 cycles with a combined rotation of ±10°. When an insufficient rotator cuff was simulated, the highest polyethylene wear rate determined was 79.67 ± 4.18 mg/10 6 cycles. Conclusions This study confirms a high dependency of the polyethylene wear behavior and dimension on the joint kinematics in total shoulder replacement. This can be explained by an increasing cross-shear stress on the polyethylene component. The results obtained indicate that additional combined kinematics are an indispensable part of wear tests on anatomic shoulder replacements. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10582746
- Volume :
- 27
- Issue :
- 9
- Database :
- Supplemental Index
- Journal :
- Journal of Shoulder & Elbow Surgery
- Publication Type :
- Academic Journal
- Accession number :
- 131293168
- Full Text :
- https://doi.org/10.1016/j.jse.2018.02.063