Whether or not to operate for an incomplete ACL injury (called a partial ACL rupture) should depend on the following: 1. clinical presentation to see if you have knee instability, if you feel unstable, a partially ruptured ACL should be operated. 2. Physical examination: An experienced doctor will determine from the findings whether the ACL has an anterior internal bundle (AMB) or a posterior external bundle (PLB) rupture. 3, imaging changes: Please see my website about the imaging characteristics of partial ACL rupture, so the presence of continuity is not surprising. After comprehensive judgment, it is not difficult to make a decision whether it is a partial rupture of the ligament and whether surgery is needed. It should be emphasized that for the management of partial rupture, outpatient consultation and personal examination by the doctor is very important.