Simultaneous 3D assessment of glenohumeral shape, humeral head centering, and scapular positioning in atraumatic shoulder instability: a magnetic resonance-based in vivo analysis

The American Journal of Sports Medicine
R von Eisenhart-RotheH Graichen

Abstract

Success rates in the treatment of atraumatic shoulder instability differ, and in vivo identification of the individual insufficient stabilizers is difficult. Atraumatic shoulder instability is an inhomogeneous entity with varying alterations of the active and passive stabilizers. This might be a reason for inferior treatment results. Case control study; Level of evidence, 3. Shoulders of 28 healthy volunteers and both shoulders of 14 patients with atraumatic instability and multidirectional laxity were examined in different arm positions using open magnetic resonance imaging. Three-dimensional postprocessing techniques were applied to determine 3D glenoid size and retroversion, radius of the humeral head, and curvature of the glenoid. The results of static stabilizers were compared with those of glenohumeral and scapular positioning in the same patients for identification of the individual insufficient stabilizers. The atraumatic unstable shoulders showed an increased mean retroversion on both sides, the difference being significant on the affected side (9.4 degrees +/- 4.8 degrees vs healthy 3.9 degrees +/- 1.3 degrees ; P < .05) with a range of 2.6 degrees to 16.6 degrees . The curvature analysis demonstrated a pronounced fla...Continue Reading

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Citations

Oct 14, 2014·Journal of Biomechanics·Andrea CereattiClaudio Rosso
Mar 8, 2016·Journal of Shoulder and Elbow Surgery·David M PriviteraLaurence D Higgins
Jun 15, 2013·Physiotherapy Research International : the Journal for Researchers and Clinicians in Physical Therapy·You-jou Hung, Warren G Darling
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