This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries of the Foot, Subject name: Orthopaedics
Bohler's angle is used in fracture of - 
Select and explain. 
A. Scaphoid, B. Talus, C. Calcaneum, D. Navicular
C: Calcaneum
Answer: C: Calcaneum 
Explanation: Ans. is 'c' i.e., Calcaneumo The Angle of Gissane, or "Critical Angle", is the angle formed by the downward and upward slopes of the calcaneal superior surface. On a lateral radiograph, an angle of Gissane of > 130deg suggests fracture of the posterior subtalar joint surface.o Bohler's angle, or "Tuber Angle", is another normal anatomic landmark seen in lateral radiographs. It is formed by the intersection of (I) a line from the highest point of the posterior articular facet to the highest point of the posterior tuberosity', and (2) a line from the former to the highest point on the anterior articular facet. An angle < 20deg suggests a depression posterior facet and possible calcaneal fracture.