This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Calcaneum is associated most commonly with which # - 
Select and explain. 
A. # rib, B. # vertebrae, C. # skull, D. # fibula
B: # vertebrae
Answer: B: # vertebrae 
Explanation: Most common mechanism of injury is fall from height, often from a ladder, onto one or both heels. The calcaneum is driven up against the talus and is split or crushed.
About one fifth of these patients suffer associated injuries of the spine, pelvis or hip.