Humerus of a Male Displaying a Transverse Fracture, Posterior View

Description

Posterior aspects of the male humerus are presented with a clean transverse fracture through the mid-diaphysis. Proximally, the humeral head and surgical neck lie superior to the shaft, while distally the medial and lateral epicondyles bracket the olecranon fossa and the posterior margin of the trochlea. The fracture line crosses the shaft near the radial (spiral) groove, which runs obliquely inferolaterally on the posterior surface and sits lateral to the long axis of the bone. Two fragments are separated at the break. A transverse midshaft humeral fracture carries a specific neurovascular implication because the radial nerve and profunda brachii artery track in the spiral groove and can be tethered at the fracture site or compressed by callus during healing. Posterior orientation makes the relationship of the fracture to the groove easier to teach than an anterior view, and it matches the mental map used when assessing wrist drop and sensory loss over the dorsoradial hand after arm trauma. Reduction strategy also differs by pattern, a transverse fracture tends to shorten and angulate with triceps pull, while unstable alignment raises concern for nonunion in the mid-diaphyseal zone. Orthopedic trauma texts and lecture decks can pair this view with AP and lateral radiographs to explain how a simple transverse humeral shaft fracture presents clinically and why a focused radial nerve exam is documented before and after splinting or operative fixation. It also fits anatomy lab teaching on posterior humeral landmarks, and operative atlases discussing posterior triceps-splitting exposure when plating is planned near the radial groove. Anatomical accuracy verified by SciePro's Medical Advisory Board.