Arthroscopic medial tenodesis of subscapularis tendon (AMTS) in static posterior shoulder dislocation (C1): a surgical technique

Posterior shoulder instability (PSI) is an uncommon and debilitating condition that is often misdiagnosed. Although the diagnosis is challenging, MRI and CT scan can help with the diagnosis showing soft tissues and bony lesions, both possibly involved in posterior shoulder instability's etiology. According to the ABC classification, C1 (constitutional static posterior instability) can be treated both conservatively and surgically, even though there is no consensus or gold standard of treatment. We propose a new arthroscopic technique consisting in a medialization of superior 1/3 part of subscapularis tendon and posterior labral advancement, through which obtain anterior translation of the humeral head and dynamic subluxation resolution.