The EUROP Mobile Bearing prosthesis was designed in order to recreate as closely as possible the natural kinematics of the knee while preserving the patient's bone health. The shape of the metal base allows to preserve or remove the posterior cruciate ligament. Its asymmetrical condyle benefits from 16 years of clinical experience. Innovative instrumentation with a ligamentary balance system allowing Minimally Invasive Surgery (MIS). Posterior indentation of the metal base allowing or not the conservation of the posterior cruciate ligament. PRotary tray. Excellent frontal and sagittal stabilization through the polyethylene insert (taking into account the lift-off). The asymmetry of the posterior tibial condyle allows for the tibial bascule to restore optimal flexion. The curvature and thickness of the trochlea optimizes the patello-femoral gorge.