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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.
But for someâwhether you just didn't get the right rehab help or surgery didn't go off as plannedâthe pain can linger. The most common symptoms of an ACL injury can be a sudden popping sensation of the knee, swelling, and an inability to extend the knee to a full range of motion, says Dr. Michael Camp, D.P.T. He adds that other signs involve tendinitis, buckling of the knee, deep throbbing pain, and unsteadiness when walking.