Primary stability of inferior tilt fixation of the glenoid component in reverse total shoulder arthroplasty: A finite element study
- Authors
- Chae, Soo-Won; Lee, Haea; Kim, Soo Min; Lee, Juneyoung; Han, Seung-Ho; Kim, Soung-Yon
- Issue Date
- Jun-2016
- Publisher
- WILEY
- Keywords
- reverse total shoulder arthroplasty; glenoid component; inferior tilt; finite element analysis; primary stability
- Citation
- JOURNAL OF ORTHOPAEDIC RESEARCH, v.34, no.6, pp 1061 - 1068
- Pages
- 8
- Journal Title
- JOURNAL OF ORTHOPAEDIC RESEARCH
- Volume
- 34
- Number
- 6
- Start Page
- 1061
- End Page
- 1068
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/6879
- DOI
- 10.1002/jor.23115
- ISSN
- 0736-0266
1554-527X
- Abstract
- Glenoid component fixation with inferior tilt has been suggested as one of the surgical methods to decrease scapular notching and improve stability, but its clinically beneficial effect remains a concern. We evaluated the influence of inferior tilt fixation of the glenoid component on primary stability in reverse total shoulder arthroplasty by finite element analysis. Finite element models were constructed from cadaveric scapulae of females over the age of 60 years and glenoid components from reverse total shoulder arthroplasty. The relative micromotion at the bone-glenoid component interface, distribution of bone stress under the glenoid component and around the screws, contact area between the bone and screws, and cut surface area of the cancellous bone exposed after glenoid reaming were analyzed and compared between a neutral and 10 degrees inferior tilt fixation of the glenoid component. The 10 degrees inferior tilt fixation demonstrated greater relative micromotion and higher bone stress than the neutral tilt fixation. Eccentric reaming, which is done to produce the inferior tilt fixation of the glenoid component, increased glenoid cancellous bone exposure and decreased bone-screws contact area. Inferior tilt fixation of the glenoid component may adversely affect primary stability and longevity after reverse total shoulder arthroplasty. (c) 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1061-1068, 2016.
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