Christelle Peyron MD, Presenter: Nothing to Disclose

Laurent Obert MD,PhD, Abstract Co-Author: Nothing to Disclose

Michel Runge MD, Abstract Co-Author: Nothing to Disclose

Julien Uhring MD, Abstract Co-Author: Nothing to Disclose

Bruno Alfred Kastler MD, PhD, Abstract Co-Author: Nothing to Disclose

Sebastien Louis Aubry MD, PHD, Abstract Co-Author: Nothing to Disclose

To evaluate the normal CT values ​​of glenoid and humeral radio-anatomical parameters useful to orthopedic surgeon

200 normal shoulder CT scans were retrospectively analysed. The average age of subjects was 49.8±18 years. Glenoid parameters measured were : maximum width, minimum width at the level of coracoid process, higher angle and lower angle defined respectively beetween North-South axis and the coracoid process (higher angle) and the pillar of the scapula (lower angle). On 137/200 CT-scans, when Pectoralis Major muscle was identifiable, the distance beetween its tendon and: the humeral head (D1), the greater tubercle (D2), the change of curvature (D3) and the anatomical neck (D4) were measured.

Maximum glenoid width was 27.4 ± 3.4mm. Minimum width was 15.5±2.8mm. Higher angle was 18.9±5°. Lower angle was 9.1± 3.4°. Maximum width is significantly higher in osteoarthritis (p=0.017) and in males (p<0.001). The distance between the tendon of pectoralis major muscle and respectively the apex of humeral head was 67,6±9,9mm (D1), the greater tubercle was 57,8±10,3mm (D2), the change of curvature was 28,7±9,0mm (D3) and the anatomical neck was 34,3±9,7mm (D4). Men have signiticantly longer distances D1 (7.8mm, p<0.001) and D2 (7.6mm, p<0.001) than women.  

Our study is one of the few in-vivo radioanatomical work and is based on a large number of subjects : it precises the exact position of glenoid bone stock, and defines new informations useful for a better positioning of the humeral part of shoulder prosthesis

Our results will be useful to improve clinical outcome after total shoulder arthroplasty

Peyron, C, Obert, L, Runge, M, Uhring, J, Kastler, B, Aubry, S, MD-CT Evaluation of Normal Glenoid and Humeral Parameters Useful for Glenohumeral Arthroplasty.  Radiological Society of North America 2012 Scientific Assembly and Annual Meeting, November 25 - November 30, 2012 ,Chicago IL. http://archive.rsna.org/2012/12043451.html