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Byung Joo Lee & Donghwi Park
Video 1: This video shows dynamic ultrasound of a 60-year-old man with posterosuperior labral tear. Although there is not definite a posterosuperior labral tear in neutral posture, a detachment of posterosuperior labral tear were seen in dynamic ultrasound during abduction and external rotation posture. The abduction and external rotation motion of the glenohumeral joint usually induces the humeral head to rotate externally, which gives stress to the posterosuperior labrum. In a normal posterosuperior labrum, only a slightly blunted posterosuperior labrum without any detachment is detected during abduction and external rotation motion. However, this motion can induce posterior and medial detachment of the labrum in patients with damaged PS labrum.