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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.
Other symptoms may include immediate swelling, an inability to fully straighten or bend the knee. The most common symptom is the feeling of the knee âgiving outâ or feeling unstable. It is not uncommon for other structures in the knee to be damaged at the same time that one injures their ACL.