RIT injections: The osteo-tendinous junction of both insertion sites of the collateral ligaments will be identified. Patients will then receive injections of 1cc of a 15% dextrose and 0.6% lidocaine solution free of adrenaline in each of eight administration sites in the collateral ligaments. A 5 cc injection of a 20% dextrose and 0.5% lidocaine without adrenaline solution will also be administered inside the knee joint. The intra-articular injection will be performed using the anterior approach. Solutions are prepared by a hospital pharmacist the morning of the injections. Each infiltration will be preceded by a local sterilization consisting of three disinfections with a 2% chlorexidine and 4% idopropyl alcohol solution.