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General Orthopaedics

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Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVIII | Pages 12 - 12
1 Sep 2012
Alami GB Pinedo M Liendo R O'Shea K Boileau P
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Purpose

To describe the geometric variables of the posterosuperior humeral-head (Hill-Sachs) lesion and analyze their relationship with patient clinical variables.

Method

Twenty-eight patients with anteroinferior instability and substantial Hill-Sachs lesions were evaluated using arthro-computer tomography (CT) scans. The images were studied with the OSIRIX software, and the following lesion variables were measured: depth, length, width, volume, surface area, and width/depth ratio. Moreover, the ratio of the humeral heads total volume over the volume under its joint surface was calculated to express the lesions severity as the compromised fraction of the humeral heads articular segment. The above data was statistically analyzed in relation to the total number of instability episodes, the distinction between dislocations and subluxations, and the type of sport played.