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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.
Swelling â Swelling starts to occur almost immediately after the tear occurs. Also known as hemarthrosis, this symptom is very common amongst ACL tears. The swelling is caused due to disruption of the anterior cruciate ligament which causes the knee joint to fill with blood.