The bones below the knee are the femoral condyles and the tibial plateau: first, if the patient maintains a standing position, the bones below the knee are the tibial plateau, which forms the tibiofemoral joint with the femur, between which are the medial and lateral menisci and the anterior and posterior cruciate ligaments, which together complete the support of the body weight and normal walking and movement, when the tibial plateau is injured, it can cause traumatic knee osteoarthritis, resulting in knee pain and even deformation may occur. Secondly, if the patient is lying down, the bone below the knee is the femoral condyle, which forms a patellofemoral joint with the patella and serves as a support point for the body to complete squatting and up and downstairs movements.