The neutral triangle is seen radiologically in-

Neutral triangle of the calcaneum Within the trabeculae of calcaneus lies the neutral triangle, an area directly below the distal edge of a posterior facet. The base of the triangle is the weakest, most vulnerable portion of the calcaneum. Axial impaction of the talus into the calcaneum results in a vertical fracture through the neutral triangle, and it represents the primary fracture line.