This life size knee model is made of transparent plastic and shows graphically the position and function of a knee endoprosthesis. The reproduced prosthesis can be removed and replaced from the model, allowing to explain the procedure very clearly during patient education and preparation of operation. The Endoprosthesis is made of metal and almost corresponds to a real prosthesis in weight and size. Due to the transparent bones the position and function of the prosthesis is clearly visible.