Case Reports Journal Article Digital dynamic radiography Dynamic digital radiography Dynamic imaging Ehlers-Danlos syndrome Glenohumeral motion Humeral head subluxation Latissimus transfer Multidirectional instability Pectoralis major transfer Posterior instability Posterior shoulder instability Posterior subluxation Scapular dyskinesia Scapulohumeral rhythm Serratus anterior palsy Shoulder diagnosis Shoulder instability Tendon transfer