Life-threatening posterior circumflex humeral artery injury secondary to fracture-dislocation of the proximal humerus.

Proximal humeral fractures account for 4% to 5% of all fractures, and most of these are minimally displaced and less prone to neurovascular injuries. This article presents a case of a 65-year-old man who injured the posterior circumflex humeral artery following a fracture dislocation of the proximal humerus leading to a life-threatening hemorrhagic complication during surgical fixation of the dislocated proximal humeral fracture. Preoperative vital signs were normal. Using the deltopectoral approach, the fracture site was exposed and the dislocated head was extracted. Blood pooled and overflowed the cavity at a brisk pace. Blood pressure dropped from 130/70 mm Hg to 90/45 mm Hg, and preoperative follow-up hemoglobin dropped to 4.8 g/dL. The axillary artery was explored and a ruptured posterior humeral circumflex artery was observed that was later ligated. In view of the damage to 1 of the circumflex humeral branches, primary hemiarthroplasty was performed. This article highlights the possibility of encountering life-threatening vascular injuries in highly displaced or dislocated 4-part proximal humeral fractures and the significance of obtaining the angiographic studies early in the course of management in such cases.