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SA Orthopaedic Journal

On-line version ISSN 2309-8309

Abstract

CRESSWELL, TR; DE BEER, JF  and  DU TOIT, D. The position of the 'bare spot' - not central in the glenoid. SA orthop. j. [online]. 2008, vol.7, n.4, pp. 37-39. ISSN 2309-8309.

Dislocation of the glenohumeral joint is often associated with a bony lesion of the antero-inferior glenoid rim. This can be assessed at arthroscopy using the 'bare spot' - an area in the central glenoid where articular cartilage is comparatively thin. The aim of this study was to assess the bare spot in a large number of cadavers. Fifty cadavers with no known history of bone or joint disease were examined. The bare spot was present in nearly 90% of shoulders and is centrally placed in the antero-posterior plane. However, the bare spot is significantly further away from the antero-inferior rim of the glenoid by 1.4 mm. The median distance from bare spot to the anterior rim is 13.2 mm, while the median distance to the antero-inferior rim is 14.6 mm. Bone loss of the antero-inferior glenoid is associated with failure of soft tissue repairs after shoulder dislocation. These data will help in the arthroscopic assessment of the glenoid and in decision-making for surgery for gleno-humeral instability.

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