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Effect of humeral stem design on humeral position and range of motion in reverse shoulder arthroplasty.
- Source :
- International Orthopaedics; Nov2015, Vol. 39 Issue 11, p2205-2213, 9p
- Publication Year :
- 2015
-
Abstract
- <bold>Purpose: </bold>The impacts of humeral offset and stem design after reverse shoulder arthroplasty (RSA) have not been well-studied, particularly with regard to newer stems which have a lower humeral inclination. The purpose of this study was to analyze the effect of different humeral stem designs on range of motion and humeral position following RSA.<bold>Methods: </bold>Using a three-dimensional computer model of RSA, a traditional inlay Grammont stem was compared to a short curved onlay stem with different inclinations (155°, 145°, 135°) and offset (lateralised vs medialised). Humeral offset, the acromiohumeral distance (AHD), and range of motion were evaluated for each configuration.<bold>Results: </bold>Altering stem design led to a nearly 7-mm change in humeral offset and 4 mm in the AHD. Different inclinations of the onlay stems had little influence on humeral offset and larger influence on decreasing the AHD. There was a 10° decrease in abduction and a 5° increase in adduction between an inlay Grammont design and an onlay design with the same inclination. Compared to the 155° model, the 135° model improved adduction by 28°, extension by 24° and external rotation of the elbow at the side by 15°, but led to a decrease in abduction of 9°. When the tray was placed medially, on the 145° model, a 9° loss of abduction was observed.<bold>Conclusions: </bold>With varus inclination prostheses (135° and 145°), elevation remains unchanged, abduction slightly decreases, but a dramatic improvement in adduction, extension and external rotation with the elbow at the side are observed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03412695
- Volume :
- 39
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- International Orthopaedics
- Publication Type :
- Academic Journal
- Accession number :
- 110451665
- Full Text :
- https://doi.org/10.1007/s00264-015-2984-3