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Symptoms of a severe and sudden (acute) anterior cruciate ligament (ACL) injury include: 1  Feeling or hearing a pop in the knee at the time of injury. 2  Sudden instability in the knee. (The knee feels wobbly, buckles, or gives out.) This may happen after a jump or change in direction or after a direct blow to the side of the knee.
Symptoms of LCL Injury. Symptoms of an LCL injury can be mild or severe, depending on the severity of the sprain or whether or not it is torn. If the ligament is mildly sprained, you may not have any symptoms at all. For a partial tear or complete tear of the ligament, your symptoms may include: 1  swelling in the knee.ymptoms of an LCL injury can be mild or severe, depending on the severity of the sprain or whether or not it is torn. If the ligament is mildly sprained, you may not have any symptoms at all. For a partial tear or complete tear of the ligament, your symptoms may include: