An ACL injury is not an end-all; with the right hands-on therapy and rehab techniques, it's still possible to get your knee back into almost pristine condition. But for some—whether you just didn't get the right rehab help or surgery didn't go off as planned—the 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.
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