Final answer:
The assertion that the surgical neck of the humerus is the most common site for fractures in the humerus is True. It's a narrow region prone to injury, particularly when the arm experiences trauma, such as falls onto the elbow.
Step-by-step explanation:
The statement is True. The surgical neck of the humerus is indeed the most common site of fracture for that bone. Located at the base of the expanded, proximal end of the humerus, the surgical neck is a narrower region where it joins with the humerus shaft, making it more susceptible to fractures compared to the anatomical neck which marks the margin of the humerus head. Injuries such as falls onto the elbow can drive the distal portion of the humerus into the proximal portion resulting in an impacted fracture. It's important to note, however, that while the surgical neck is a common site for fractures, Colles fracture of the distal radius is the most common forearm fracture occurring from similar trauma.