The symptoms of a torn cruciate ligament include the following: a. Pain. When the cruciate ligament is torn, the patient will often hear a “pop” sound, which is the sound of the ligament rupture, followed by severe pain in the joint. Swelling. After a cruciate ligament tear, there will be intra-articular bleeding, which will lead to swelling of the knee joint and a positive floating patella test. Restricted movement of the joint. After the ACL tear, the knee joint is afraid to move in the acute stage, and with old ACL tear, there will be limitation of movement, not able to walk fast, the tibia feels misaligned forward and backward when going up and down stairs, and there is weakness of the limb. Therefore, if you have a torn cruciate ligament, you should go to the hospital, have an MRI done, and get the appropriate treatment according to the situation.