1. It is applicable to bone defects caused by tumors, comminuted fractures or other reasons in the femoral, tibial and knee joints;
2. Could be replaced by any length according to the condition of bone defect;
3. Imitate human kinematics and design a new axis;
4. The tibial prosthesis has the attachment points of patellar ligament and lateral collateral ligament, which is conducive to the attachment of ligament and soft tissue and stabilize the prosthesis.