Explanation:
The radial nerve travels along the spiral groove of the humerus, making it particularly vulnerable in midshaft humeral fractures. Injury to this nerve may result in wrist drop due to loss of extensor muscle function. Sensory deficits may occur over the dorsum of the hand. Many radial nerve palsies associated with closed fractures recover spontaneously. Surgical exploration may be considered if recovery does not occur. Careful neurological examination is essential in all humeral fractures. Reference: Holstein A. "Radial Nerve Palsy Associated with Fracture of the Humerus." Journal of Bone and Joint Surgery, 1963.