## **Core Concept**
Bohler's angle, also known as the tuber joint angle, is a significant radiological measurement used in the assessment of fractures in the tarsal bones, specifically focusing on the calcaneus. It is defined as the angle formed by two lines drawn through the superior and inferior aspects of the calcaneus on a lateral foot or ankle radiograph.

## **Why the Correct Answer is Right**
The correct answer, , is right because Bohler's angle is specifically measured to assess fractures of the calcaneus (heel bone). This angle helps in determining the integrity of the calcaneus and is crucial in diagnosing calcaneal fractures. A decrease in Bohler's angle indicates a compression fracture of the calcaneus.

## **Why Each Wrong Option is Incorrect**
- **Option A:** - This option is incorrect because, although the cuboid bone is a tarsal bone, Bohler's angle is not specifically related to fractures involving this bone.
- **Option B:** - This option is incorrect because the angle in question is not related to the navicular bone.
- **Option D:** - This option is incorrect because Bohler's angle does not pertain to fractures of the cuneiform bones.

## **Clinical Pearl / High-Yield Fact**
A normal Bohler's angle ranges from 20 to 40 degrees. A decrease in this angle can indicate a calcaneal fracture. Clinically, it's essential to remember that a fracture of the calcaneus can lead to a decrease in Bohler's angle, which might necessitate further imaging and possible surgical intervention.

## **Correct Answer:** . Calcaneous.