Reconstruction of Humeral Head with G Graft Block in Case of Locked Posterior Shoulder Dislocation (LPSD)

Locked posterior shoulder dislocation (LPSD) is an erratic and traumatic disorder usually ignored due to its inadequate examination. This can lead to fracture dislocation or impression fractures if left untreated. It is commonly a result of trauma, electric shock injury, or seizures. Impression fracture of the anteromedial humeral head, also known as reverse Hill-Sachs lesion is a rare finding which is detected in 40%–90% of cases of posterior dislocation. Here, we report such a rare case of LPSD with reverse Hill-Sachs lesion which was initially managed with closed reduction but was unsuccessful. After confirming the diagnosis on computed tomography imaging, a novel technique for reconstruction of the humeral head using a G graft block (hydroxyapatite with collagen), followed by fixing with two cannulated cancellous screws from the lesser tuberosity, was performed. Recovery was satisfactory, with good shoulder joint movement observed at 8 months post-surgery and a total follow-up of 3 years.