Fractured Humerus, Posterior View

Description

Positioned in anatomical orientation, the posterior brachium is rendered with semi-transparent integument, exposing the humeral shaft from the proximal surgical neck region down to the distal supracondylar area, with the scapulohumeral and humeroulnar articulations included for context. A comminuted mid-diaphyseal fracture disrupts the posterior cortex near the spiral groove (radial groove), where the radial nerve and profunda brachii vessels normally course obliquely from medial to lateral on the posterior surface. Posterior muscle masses are suggested around the bone, consistent with the triceps brachii enveloping the shaft, while the rib cage silhouettes faintly deep to the arm to anchor body position. Fracture hematoma is indicated at the fragment margins. Posterior humeral shaft injuries matter because the radial nerve lies tethered in the spiral groove, and fragment displacement can produce neuropraxia or worse, classically presenting with wrist and finger extension weakness and dorsal hand sensory loss. This view also clarifies why posterior approaches to the humerus, and posterior plating strategies, demand deliberate identification and protection of the nerve as it crosses from the medial head of triceps toward the lateral intermuscular septum. A small structure. Big consequences. Use this plate-ready artwork in orthopedics and trauma modules when teaching humeral shaft fracture patterns (including comminution), in operative technique chapters describing posterior exposure and radial nerve exploration, or in patient-facing counseling material explaining expected neurovascular checks after injury and reduction. Anatomical accuracy verified by SciePro's Medical Advisory Board.