Lateral calcaneal osseous landmarks
The lateral surface of the calcaneus presents three distinctive features: the peroneal trochlea, the retrotrochlear eminence and a tubercle for the attachment of the calcaneofibular ligament. The peroneal trochlea is usually located around one finger breadth below the apex of the lateral malleolus. Note that this feature displays significant variation. The peroneal trochlea is the anatomical point which separates the passage of the peoneus brevis tendon from the passage of the peroneus longus tendon inferiorly. The retrotrochlear eminence is a rounded prominence located in a position which is posterior and superior to the peroneal trochlea. It is usually one of the most consistent anatomical landmarks on the lateral calcaneus. The tubercle for the insertion of the calcaneofibular ligament is not often easily identified. The tubercle provides an attachment point for calcaneofibular component of the lateral ankle ligament complex and is located superior and approximately 1cm posterior to the peroneal trochlea.