The radial nerve is at greatest risk for injury with which fracture?

B. Fracture of the shaft of the humerus.

DISCUSSION: The radial nerve lies in proximity to the humerus as it courses laterally at the junction of the middle and distal thirds of the shaft of the humerus. Therefore, it is at greatest risk of injury in shaft fractures. If radial nerve paralysis is present in association with this fracture, it is advisable to observe the patient since most nerve injuries recover spontaneously within 6 to 12 weeks.