Rotating hinge (RH) knee prosthesis is a common solution used for revision procedure. Nevertheless, it is also used in complex primary surgery as an alternative of primary total knee arthroplasty. One of the most used RH implants is the Endo-Model rotating Hinged Knee Prosthesis, which enable knee flexion-extension and intra-extra rotation. The design of this prosthesis consists of a femoral and a tibial component, which are rigidly constrained, and a polyethylene insert placed between these two elements, which prevent luxation without reducing the range of motion. This kind of prosthesis thus is a highly constrained device able to provide the stability needed for arthroplasty in complex situations such as severe varus or valgus deformity.