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.