ANAMNESIS: Timetable of disorder (progression, trauma, previous surgery, chronology).- Type of disorder.- Localization.- Activity dependence.- Barometric dependence.- Personal anamnesis (other pathologies and surgery). CLINICAL EXAMINATION: Independent walk, gait.- Static (standing on the cube and podoscope).- Passive joint mobility (sitting on the cube).- Active joint mobility.- Joint stability.- Visualization and palpation. RADIOLOGICAL SCREENING: Conventional radiographs.- CT.- MRI. SURGICAL CORRECTIONS: Reorientation of the upper ankle joint.- Reorientation of the lateral malleolus.- Osteochondroplasty of the talus.- Lateralisation of the hindfoot axis.- Reorientation arthrodesis of the subtalar joint.- Ligamentous reconstruction of the ligaments about the upper ankle joint.- Removal of impingements at the upper ankle joint.- Removal of impingements at the lower ankle joint.- Reorientation of the lower ankle joint.- Functional extension of the hindfoot.- Tibialis anterior tendon transfer on the lateral dorsum of the foot.- Flexor digitorum longus tendon transfer onto the first cuneiform.- Fibularis longus tendon transfer onto the fifth metatarsus.- Flexor hallucis longus tendon transfer on the fifth metatarsus.- Reorientation of the first tarso-metatarsal joint.- Reorientation of the lesser metatarsal heads.- Functional correction of the toes.