Figure 1.

Schematic depiction of the COR method to determine the AT moment arm. Two anatomical landmarks are marked on the talus in dorsiflexed and plantarflexed position, respectively. From the straight line connecting them, two more straight lines are drawn at a perpendicular angle. The resulting figures are overlaid on the neutral position image. The intersection of the straight lines drawn from a–a' and b–b' represents the COR. The AT moment arm is the shortest distance between the tendon and the COR.