Final answer:
Boehler's Angle is measured using landmarks on a lateral foot x-ray, and a positive result, typically between 20° to 40°, indicates a normal calcaneus, while a decreased angle suggests a calcaneal fracture. An decreased Boehler's Angle signifies a collapse of the posterior facet or compression of the calcaneus, which is indicative of a fracture.
Step-by-step explanation:
Boehler's Angle is a radiographic measurement used in orthopedics to assess calcaneal fractures. This angle is determined by drawing lines on a lateral foot x-ray: the first line runs from the highest point of the anterior process of the calcaneus to the highest point of the posterior articular surface, and the second line runs from the highest point of the posterior articular surface to the highest point of the posterior calcaneus.
The angle between these two lines is Boehler's Angle. A positive Boehler's Angle typically ranges from 20° to 40° and indicates a normal, uninjured calcaneus. An decreased Boehler's Angle signifies a collapse of the posterior facet or compression of the calcaneus, which is indicative of a fracture.