What Are the Symptoms of a Knee Ligament Tear?

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The symptoms of a knee ligament tear are severe pain and swelling of the knee, according to the American Academy of Orthopaedic Surgeons and MedlinePlus. The patient might also hear a "pop" when the injury occurs, and the knee is unstable and painful when the patient attempts to put weight on it. The knee might feel vulnerable to giving out when the patient tries to walk.