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.