In pediatric supracondylar humerus fractures, which neurovascular structures are of concern?

• A. Median nerve and brachial artery
• B. Ulnar nerve and radial artery
• C. Radial nerve and cephalic vein
• D. Axillary nerve and subclavian artery

Answer: (A)

In supracondylar humerus fractures, the structures most at risk are the ones that lie in front of the distal humerus—the brachial artery and the median nerve. When the distal fragment shifts backward (the common extension-type injury in kids), it can compress or injure these anterior structures as they run together in the arm and cross the elbow region. Injury to the brachial artery can compromise distal perfusion, making it crucial to assess pulses and limb viability, while median nerve injury can produce motor and sensory deficits in the forearm and hand, including issues with thumb and index/middle finger flexion and sensation in the lateral palm and fingers. The other options involve nerves and vessels that are not typically endangered by this fracture pattern: the ulnar nerve and radial artery are more at risk with injuries near the medial epicondyle or at the forearm, the radial nerve lies more laterally/posteriorly around the humerus, and the axillary nerve with the subclavian artery are proximal to the elbow and not involved in distal humerus injuries.