A Rare Aberrant Division of Radial Nerve Encountered During Fixation of Distal 1/3rd Shaft Humerus Fracture

Abstract The radial nerve is a continuation of the posterior cord, which is composed of axons from C5 to C8. Rarely are abnormalities in the posterior cord’s branching pattern mentioned in the literature. An unusual change encountered in the radial nerve is described in this case report, during fixation of distal 1/3 rd shaft humerus fracture left side in a 22-year-old male, where the radial nerve is seen as two distinct bundles, anterior and posterior. The posterior division provided aberrant branches to the long head of the triceps muscle, medially, while the anterior division persisted as the main radial nerve. To expose the humerus shaft for fixations, an orthopedic surgeon must be aware of the radial nerve divisions.