ACL Tear Symptoms: When Do You Need Surgery? A Knee injury can happen unexpectedly during sports, exercise, or everyday activities. You hear a "pop." Your knee swells and feels weak. Some people assume the injury will improve without treatment. But these could be ACL tear symptoms, and the right https://www.tumblr.com/medjournalhealthcare/831973505125990400/acl-tear-symptoms-when-do-you-need-surgery