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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.
When the ACL tears, you may hear a popping sound. When you stand, the knee will probably give-way immediately, and it will be difficult to walk on the affected leg. There is usually moderate pain and swelling of the knee joint, although in the first several hours, this may be minor. It will, however, worsen over the first two days, and then begin to subside.