“…Complete clavicular agenesis is seen in 10% of patients, who have sloping and hypermobile shoulders [7], a small biacromial diameter, and the ability to approximate the shoulders anteriorly [8][9][10][11][12]. This hypermobility does not seem to promote instability of the glenohumeral joint, since reports of shoulder dislocation as a complication of CDD are scarce and always consist of anterior dislocation [12,13]. The original feature of our case-report is the previously unpublished combination of posterior glenohumeral dislocation and bilateral clavicular agenesis.…”