The authors have studied variations of Böhler's angle by various radiographic incidences. They have defined anatomic references of this angle on the correspondent dry bone. With the same radiographic incidences, Böhler's angle was 32 degrees. This value remained constant when X-ray incidences were modified with 15 degrees in all the directions from the external profile. Anatomic variations of the 3 references on dry bone which define this angle, were very small. Böhler's angle is therefore a good morphologic reference for evolutive study of each patient. It's variation in population needs comparative radiographic control of the opposite side.
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