This is a prospective, single-center, observational study. The inclusion period is set at 12 months.
Patient aged 18 years or older
Patient informed about the study and who has not opposed the use of their personal medical data
Patient scheduled for arthroscopic shoulder surgery
Allergy to local anesthetics or epinephrine
Contraindications to Interscalene Block (e.g., respiratory disease, pneumothorax, pneumonectomy, phrenic or recurrent laryngeal nerve paralysis)
Coagulation disorder
Patients unable to understand the study information and objectives: dementia, psychosis, consciousness disorders, non-French-speaking patients