This LEFT KNEE manufactured by Nacional Ossos for planning and training of orthopedic surgery, with mechanical properties similar to human bone, composed of LEFT FEMUR, LEFT TIBIA, being the bones with cancellous, cortical structure and medullary canal, also joined, by simulation of collateral ligaments ( lateral and medial) and crossed (anterior and posterior) with simulated capsule for arthroscopy procedure. Ideal for placement of hip prosthesis, knee prosthesis, intramedullary nail, placement of screws, plates, external fixator and anchors. It allows the orthopedist to have training, very close to reality, empowering themselves with respect to Bioethics. It can be attached to the line of vises, which allow the orthopedist to work with both hands as necessary in all axes, as in a real patient, with firmness and safety.