Chronic Pain and Functional Prognosis After Total Knee Replacement: Continuous Locoregional Analgesia by Catheter to the Femoral Triangle Versus Tissue Infiltration as Part of an Improved Rehabilitation After Surgery Approach

Inclusion Criteria: * Adult patient; * Placement of unilateral tricompartmental knee prosthesis for gonarthrosis; * ASA score between I and III ; * Nonseptic scheduled surgery; * Knee replacement scheduled on one of the first 3 days of the week (Monday to Wednesday included) in order to benefit from a homogeneous postoperative physical therapy; * Able to understand the protocol; * Having agreed to participate in the study and having given express oral consent; * Affiliated with a social security system; * Possibility of being followed as part of the protocol. Exclusion Criteria: * Age \>= 86 years old; * BMI \> 35 ; * Revision of knee replacement; * Symptomatic contralateral osteoarthritis; * Anterior of surgery on the operated knee (excluding arthroscopy and meniscectomy); * Vascular surgery on the femoral vessels on the operated side; * Concept of diffuse polyalgia syndrome (fibromyalgia); * Documented neuropathy of the lower limb; * Localized infection at the catheter puncture site (femoral triangle); * Known allergy to Ropivacaine; * Renal insufficiency (Clearance - CKD-EPI formula - creatinine \<30 ml/min) and/or severe hepatic insufficiency (prothrombin blood level \<50%) ; * Inflammatory rheumatic disease (rheumatoid arthritis, ankylosing spondylitis...) ; * Patients on immunosuppressive or systemically administered corticosteroid therapy; * Daily use of level II or III analgesics for more than one month pre-operatively; * Known intolerance to tier III analgesics; * Allergy or contraindications to standard treatments administered per and postoperatively (paracetamol, NSAIDs); * Patient undergoing knee surgery in the year prior to inclusion and participating in the study; * Patients who do not cooperate or do not understand French, difficulties in understanding and evaluating the pain score, preoperative cognitive dysfunction making the interview unreliable; * Patient under guardianship, curators, deprivation of liberty; * Patient already engaged in another interventional clinical study (category 1); * Pregnant or breastfeeding women, or women in a position to procreate who refuse an effective means of contraception; * Refusal to participate; * Inability to understand the protocol and its requirements, and/or to give express oral consent.