Which of these is NOT typically considered an arm injury?

The correct answer is that a fracture of the femur is NOT typically considered an arm injury because the femur is located in the thigh, which is part of the leg, rather than the arm. When discussing arm injuries, we generally consider fractures that occur in the bones of the upper limb, specifically those bones that make up the arm, such as the humerus (the upper arm), the radius, and the ulna (the two bones of the forearm). Fractures of these bones are directly related to arm injuries, as they occur in the regions of the upper extremities used for various functions including lifting, reaching, and manipulation of objects.

In contrast, the femur is the longest bone in the body and supports the weight of the upper body while allowing motion of the leg. Its fractures typically result from significant trauma and are classified under lower extremity injuries, clearly delineating them from arm injuries.