For doctors, the damage or tearing of ligaments actually means more or less the same thing, but for ordinary people, there always seems to be a difference between the two, feeling that the range covered by ligament damage is broader than that of ligament tearing. From a medical perspective, ligament damage is divided into four grades. The first grade is a sprain, which is a partial fiber break. The second type is a partial ligament rupture, the third type is a complete ligament rupture, and the fourth type involves a complete rupture of the ligament with damage to other parts as well. This is the four-category classification of ligament damage. Ordinary people might think that ligament tearing refers to either a partial or complete rupture of the ligament, which is the more serious kind. Therefore, though these two concepts are relatively similar in meaning, ordinary people might feel that ligament tearing is relatively more severe, consisting of either a partial or complete rupture of the ligament.