The e.motion® system is a modern mobile bearing knee arthroplasty system. The mobile bearing polyethylene inlay allows high congruence to be combined with low constraint forces, thereby improving wear resistance and therefore minimizing the incidence of implant loosening. The e.motion® implant solutions are modular from primary to revision enabling the surgeon to choose the right option per case. The e.motion® system has a long clinical background with excellent clinical evidence shown here.