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. Many people ignore this and hope it will heal on its own. But these could be ACL tear symptoms, https://app.notion.com/p/ACL-Tear-Symptoms-When-Do-You-Need-Surgery-40af0ffaeda780df9581ce8be7f83a8a?source=copy_link