Signs and symptoms of an ACL injury usually include: ACL  A loud pop or a "popping" sensation in the knee Severe pain and inability to continue activity Rapid swelling Loss of range of motion A feeling of instability or "giving way" with weight bearing 
signs symptoms acl injury include: acl  loud pop "popping" sensation knee severe pain inability continue activity rapid swelling loss range motion feeling instability "giving way" weight bearing 
acl injury