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Functional malcentering of the humeral head and asymmetric long-term stress on the glenoid : potential reasons for glenoid loosening in total shoulder arthroplasty

von Eisenhart Rothe, R. and Müller-Gerbl, M. and Wiedemann, E. and Englmeier, K. H. and Graichen, H.. (2008) Functional malcentering of the humeral head and asymmetric long-term stress on the glenoid : potential reasons for glenoid loosening in total shoulder arthroplasty. Journal of shoulder and elbow surgery, Vol. 17, H. 5. pp. 695-702.

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Official URL: http://edoc.unibas.ch/dok/A6005503

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Abstract

We tested the hypothesis that functional malcentering of the humeral head during arm elevation exists in patients with glenohumeral osteoarthritis and influences long-term glenoid loading. Twenty-eight healthy volunteers and 10 patients with primary osteoarthritis, 10 with cuff-arthropathy, and 1 with dysplastic glenoid were examined. Open magnetic resonance imaging and 3-dimensional (3D) digital postprocessing techniques were applied in various arm positions. Osteoabsorptiometry was used to determine 3D subchondral mineralization patterns of the glenoid as an indicator of integral long-term stress distribution. At 30 degrees of abduction, 5 patients demonstrated malcentering of the humeral head posteriorly; all patients with cuff arthropathy had malcentering superiorly. At 90 degrees, most patients displayed significant (P > .001) malcentering in the superior and posterior direction. The shoulders showed maximal subchondral mineralization patterns in the direction of malcentering. Most patients with glenohumeral osteoarthritis displayed functional malcentering, which might be responsible for postoperative glenoid loosening in shoulder arthroplasty if not corrected intraoperatively.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Division of Anatomy > Musculosceletal Research (Müller-Gerbl)
UniBasel Contributors:Müller-Gerbl, Magdalena
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Mosby
ISSN:1058-2746
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:23 May 2014 08:33
Deposited On:23 May 2014 08:33

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