When the ACL tears, you may hear a popping sound. As 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.
The doctor will ask about your symptoms and how you injured your knee. A physical exam will be performed.
Tests may include:
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