Evaluation of Ankle Propriocement and Stability

Inclusion Criteria: * patients who must undergo surgery; * patients of both sexes aged between 18-40 years; * patients who have given their informed written consent to participate in the study; * patients who have given their consent to reach the Hospital to perform the 4-month check-up Exclusion Criteria: * patients with BMI\> 30 kg / m2; * patients with rheumatoid arthritis; * patients with chronic inflammatory joint diseases; * patients with pre-existing abnormalities of the ambulatory kinematics (amputations, neuro-muscular diseases, polio, hip dysplasias); * patients with Severe arthrosis of the ankle (Kellgren-Lawrence\> 3); * patients with Severe knee arthritis (Kellgren-Lawrence\> 3); * patients with ACL injury; * patients with severe postural instability; * patients with cognitive impairments; * patients with concomitant neurological diseases.