Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Figure 8.11 Fractures of the Humerus and Radius Falls or direct blows can result in fractures of the surgical neck or shaft of the humerus. Falls onto the elbow can fracture the distal humerus. A Colles fracture of the distal radius is the most common forearm fracture. Answer: elbow
A:
Falling onto what joint can fracture the distal humerus?