Multibody System of the Upper Limb Including a Reverse Shoulder Prosthesis

摘要: The reverse shoulder replacement, recommended for the treatment of several pathologies such as cuff tear arthropathy and fractures in elderly people, changes biomechanics when compared to normal anatomy. Although musculoskeletal models upper limb have been presented study joint, only a few them focus on shoulder. This work presents biomechanical model limb, including prosthesis, evaluate impact variation joint geometry position function is based which modified account properties DELTA® prosthesis. Considering two models, simulate anatomical joints, muscle lengths, moment arms, reaction forces are evaluated. force sharing problem solved motions unloaded abduction coronal plane anterior flexion sagittal plane, acquired using video-imaging, through minimization an objective related metabolic energy consumption. After replacement significant length pectoralis major, latissimus dorsi, deltoid, teres minor, coracobrachialis, biceps brachii muscles observed reference considered limb. shortening major minor most critical since they become unable produce active this position. Substantial arms also observed, consistent with literature. As expected, there increase deltoid more fibers able elevate arm. solutions support advantages attributed design show activity from coracobrachialis muscles. glenohumeral estimated up 15% lower than those data here complements previous publications, which, all together, allow researchers build