1. Biomechanical investigation of arm position on deforming muscular forces in proximal humerus fractures
- Author
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Chalmers, Christen E, Wright, David J, Patel, Nilay A, Hitchens, Hunter, McGarry, Michelle, Lee, Thay Q, and Scolaro, John A
- Subjects
Allied Health and Rehabilitation Science ,Biomedical and Clinical Sciences ,Clinical Sciences ,Health Sciences ,Musculoskeletal ,Proximal humeral fracture ,Biomechanics ,Rotator cuff ,Shoulder joint ,Biomechanics ,Rotator cuff ,Shoulder joint - Abstract
BackgroundMuscular forces drive proximal humeral fracture deformity, yet it is unknown if arm position can help mitigate such forces. Our hypothesis was that glenohumeral abduction and humeral internal rotation decrease the pull of the supraspinatus and subscapularis muscles, minimizing varus fracture deformity.MethodsA medial wedge osteotomy was performed in eight cadaveric shoulders to simulate a two-part fracture. The specimens were tested on a custom shoulder testing system. Humeral head varus was measured following physiologic muscle loading at neutral and 20° humeral internal rotation at both 0° and 20° glenohumeral abduction.ResultsThere was a significant decrease in varus deformity caused by the subscapularis (p
- Published
- 2022