Evaluation of a New Tool for Measuring Hindfoot Alignment Under Load and in 3D.

The automated TALAS measurement tool, working with the Cone Beam 3D scanner under load, provides a reproducible measurement of the Foot Ankle Offset (FAO). It is possible to determine an average value and the standard deviation of FAO in the relevant population. And to differentiate significantly the populations with a neutral alignment, varus or valgus.

Inclusion Criteria: * Patient selected for a preoperative assessment in foot or ankle surgery, or patient seen in follow-up consultation for which a Cone Beam under load is prescribed * Patient having been informed of this study and having given their consent * Patient over 18 years old * Unprotected adult Exclusion Criteria: * Patient with a contraindication to the Cone Beam under load * Patient refusing to participate in this study * Non-plantigrade foot under load (impossibility of simultaneously resting M1, M5 and Calcaneus on the ground) * Patient who has already participated in the 3D HAM study (patients who would have participated in the study during the preoperative consultation for which another Cone Beam would be prescribed during the follow-up consultation. These patients would not be able to participate again in this study).