The normal value for this angle is between 20° to 40°. A value less than 20° can be seen in calcaneal fracture. However, a normal Böhler angle does not exclude a calcaneal fracture.

 

References:

  1. Isaacs JD, Baba M, Huang P, Symes M, Guzman M, Nandapalan H, et al. The diagnostic accuracy of Bohler’s angle in fractures of the calcaneus. The Journal of emergency medicine. 2013;45(6):879-84.