Pain in the medial knee eye position is mainly due to the following reasons: First, damage to the anterior horn of the medial meniscus of the knee joint, such as the knee joint in the semi-flexed position for flow, as well as falling from a high place, due to the meniscus to carry the pressure is relatively large, resulting in damage, there will be obvious pain in the medial knee eye position, this is due to the peripheral nerves after the damage to the stimulation of the result. Second, due to the medial knee eye position of the ligament and muscle tissue damage, such as the collision of external forces, will produce localized bruising and edema, there will also be obvious pain. Third, may be due to the knee joint cold, or have excessive fatigue strain, as well as in this position there are some bone hyperplasia and calcification, produce inflammation foci, will have a peripheral nerve stimulation, will be manifested in the medial knee eye position of the pain.