Contribution of an Off-the-shelf Carbon Ankle Foot Orthosis (AFO) in the Management of Walking Functional Impairment

Inclusion Criteria: * Patient with a foot levator muscles impairment (single or bilateral drop foot) and / or instability of the back of the foot, associated with a deficit of the triceps * Patient with inability to stand on tip-toe on one foot * Patient having signed a free and informed consent * Patient affiliated or entitled to a social security scheme Exclusion Criteria: * Patient with fixed varus-equine foot * Patient with an unstable skin condition (whether or not treated with additional treatment that may change the footwear) * Patient with a a foot levator muscles impairment with a deficiency of the quadriceps and hamstrings (knee involvement) * Patient with uncontrolled spasticity * Patient for whom foot surgery is planned during the study * Patient with one of the contraindications to the use of carbon medical device, indicated in the instructions for use * Patient with one of the contraindications to the use of the standard plastic ankle foot orthosis, indicated in the instructions for use * Patient with orthopedic comorbidities affecting the musculoskeletal system * Pregnant woman * Patient with major cognitive impairment incompatible with participation in a clinical trial * Patient participating in another clinical investigation conducted to establish the compliance of a MD impacting the evaluation criteria * Patient who cannot be followed for 12 weeks * Vulnerable patient according to article L1121-6 of the public health code, persons subject to a measure of judicial protection or unable to consent freely