There is a calcaneus fracture on the lateral view with ankle joint effusion. The Bohler’s angle is severely reduced.

Bohler’s angle is formed by drawing two lines through the three highest points of calcaneus.

• First line is drawn from the highest posterior point of the calcaneum to the highest mid point.
• Second line is from the highest anterior point of calcaneum to the highest mid point.

Normal angle should be 30-40 degrees.

In calcaneal fractures, this angle may be significantly reduced.

Sometimes, calcaneal fractures are only apparent when Bohler’s angle is measured. However, a normal Bohler’s angle does not exclude a fracture.

Reference: Grainger & Allison’s Diagnostic Radiology, 6th Edition.