A radiograph of a AP mortise projection of the ankle reveals that the lateral malleolus is slightly superimposed over the talus and the lateral joint space is not open.What is most likely the cause for this radiographic outcome?

Question

Quizplus · Accepted Answer

Insufficient medial rotation of the foot and ankle can cause the lateral malleolus to superimpose over the talus and the lateral joint space to not be open in an AP mortise projection of the ankle. This is because insufficient medial rotation causes the talus to be positioned further laterally, leading to superimposition of the lateral malleolus over the talus.

A Radiograph of a AP Mortise Projection of the Ankle