Inclusion Criteria:  Patient over 18 years of age Patient who has read and signed the consent form for participation in the study Patient operated on for primary ACL ligamentoplasty with or without meniscal repair Patient with reducible flatus >10° at 1 month post ligamentoplasty  Exclusion Criteria:  Revision ligamentoplasty Multi-ligament knee Patient under court protection, guardianship or trusteeship Patient not affiliated to the French social security system Patient participating in another therapeutic protocol Pregnant woman or woman of childbearing age without effective contraception Patient unable to understand the informed information and/or to give written informed consent: dementia, psychosis, disturbed consciousness, non-French speaking patient Patient with known hypersensitivity to botulinum toxin Patient with peripheral neuromuscular dysfunction or pronounced atrophy of the semitendinosus muscle Patient treated with anticoagulants, chloroquine (or hydroxychloroquine) Patient treated in the previous seven days with antibiotics or muscle relaxants (such as tubocurarine)