There is an obvious comminuted intra-articular fracture of the calcaneus on the x-ray.
The Bohler’s angle is significantly reduced.
Bohler’s angle is an anatomic landmark on a lateral ankle x-ray. Normal value is between 20-40 degrees. An angle of less than 20 degrees indicates a compression fracture of the calcaneus.
The Bohler’s angle is formed by drawing 2 lines:
- A line from the highest point of the calcaneal tuberosity to the highest point of the posterior facet of the calcaneus.
- Another line from the highest point of the posterior facet to the top of the anterior process.
The intersection of the above two lines is Bohler’s angle.
Caveat- a normal Bohler’s angle does not exclude a calcaneal fracture.
Reference – Fundamentals of Diagnostic Radiology by Brant and Helms.