Patients will be subjected to the same tests at zero time and 9 months after the implantation of the prosthesis, except for RSA which will be performed only 9 months after the surgery.
The objective is to study the joint kinematics of the prosthetic implant, in terms of translation, rotation, Range of motion and proprioception, in patients treated for prosthetic replacement of the ankle, quantitatively and under physiological load conditions.