Multiple factors are involved in chronic lateral instability of the ankle. The geometry of the foot may be of importance. A cavovarus foot may predispose to lateral ligament injuries. In the present study, standardized lateral X-rays were obtained of the feet of patients with chronic instability and of a control group. Four parameters were used: (1) the tarsal index as described by Benink; (2) the talocalcaneal angle; (3) the talometatarsal angle; and (4) the calcaneal angle. No relationship between lateral instability of the foot and foot geometry was found. The talocalcaneal angle as defined in this study was found to be a less appropriate parameter in measuring the longitudinal foot arch.

doi.org/10.1016/S0958-2592(96)90054-1, hdl.handle.net/1765/58881
The Foot
Department of Orthopaedics

Louwerens, J. W. K., Ginai, A., van Linge, B., & Snijders, C. (1996). Chronic instability of the foot and foot geometry: A radiographic study. The Foot, 6(1), 13–18. doi:10.1016/S0958-2592(96)90054-1