The left knee joint to the tibial intercondylar ridge becomes pointed suggesting tibial plateau injury or degenerative disease of the knee joint. 1. Tibial plateau injury: the tibial plateau is located at the proximal end of the tibia, which consists of the medial and lateral condyles of the tibia and intercondylar elevation, and the intercondylar ridge of the tibia is the intercondylar elevation part. If there is a fracture of the tibial plateau, the intercondylar ridge may become pointed due to the extrusion of external force, and it will be accompanied by the damage of the cruciate ligament of the knee joint and the limitation of the knee joint function, which is commonly seen in young and middle-aged patients. 2. Degenerative disease of knee joint: common in middle-aged and old people, when middle-aged and old people have degenerative disease of knee joint, it will lead to laxity of soft tissues and internal ligaments around the knee joint, and joint instability. In order to fight against the joint instability, there will be proliferation of intercondylar ridge to maintain the stability of the joint, which is a kind of self-repairing performance of the organism. It is not possible to determine the cause of the abnormal knee examination results alone, and it is necessary to combine the characteristics of the medical history and other examination results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of the doctor and targeted treatment.