The humeral avulsion of the glenohumeral ligament (HAGL) is a cause of recurrent shoulder instability reported in 1%–9% of patients with shoulder instability. This lesion is usually present in association with other shoulder injuries like the classic Bankart lesion, other labral lesions, bone avulsions, Hill-Sachs fractures, or even rotator cuff tears. The HAGL lesion is an injury of the inferior glenohumeral ligament complex that consists of an anterior and a posterior band, which represent thickenings of the capsule, and an interposed axillary pouch, reaching from the inferior glenoid to the humerus just below the anatomical neck. Injury to the anterior band is found in up to 93% of cases, and injury to the posterior band in 7% of cases. Isolated capsular tears may also be responsible for recurrent instability. The prevalence of this lesion is believed to be around 15% in patients with acute anterior dislocation, although most of them seem to heal spontaneously, and large, isolated tears are rare. Most HAGL injuries need surgical treatment, but many capsular tears can be managed conservatively. Currently, all these injuries are managed arthroscopically with successful results. Both anterior and posterior HAGL injuries can be managed arthroscopically with the direct repair of the detached capsule to its humeral origin, but, for anterior HAGL, a Latarjet procedure seems to be also effective. For capsular tears, a direct arthroscopic repair with sutures is the best alternative. These procedures have a very low risk of complications and success rates over 90%.