A calcaneal fracture sustained from a fall from height shows a decreased Bohler's angle (less than 20°). This angle is measured between:

• A The sustentaculum tali and the posterior facet
• B The anterior process and the posterior superior tuberosity, bisected by the posterior facet ✓
• C The plantar surface of the calcaneum and the floor
• D The talar neck and the tibial shaft

Explanation

Bohler's angle (tuber-joint angle) is measured on a lateral calcaneal X-ray as the angle between two lines: one from the anterior process to the highest point of the posterior facet, and the second from the posterior superior tuberosity to the same highest point of the posterior facet. Normal: 20–40°. Flattening of this angle (<20°) indicates intra-articular comminution and depression of the posterior facet (Sanders classification). Values below 0° indicate severe comminution with reversal of the normal architecture.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.