Use of a Treated, Devitalized and Sterile Umbilical Cord Amniotic Membrane in the Treatment of STT Osteoarthritis

Inclusion Criteria: * Male or female; age between 18 and 75 years. * Patient with symptomatic STT OA. * Patient treated medically for functional signs for more than 3 months, without improvement, justifying a surgical intervention. * Patient with a QuickDash score \> 33 points (converted to 50%). * Patient with wrist pain in front of the STT joint at rest = or \> 4/10 on VAS. * Patient who received the study information and provided consent. * Member or beneficiary of a national health insurance plan. Exclusion Criteria: * Pregnant or breastfeeding woman; woman without effective contraception. * Patient with functional rhizarthrosis that has not been stabilized or treated medically or surgically. * Patient with signs of neuropathy with functional disorders such as hyperesthesia. * Patient with uncontrolled epilepsy or neuropathy that contraindicates locoregional anesthesia. * Person confined by a judicial or administrative decision. * Adult subjected to legal protection measures or unable to provide his/her consent.