Understanding ACL Tear Symptoms And the Need for 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 https://app.notion.com/p/ACL-Tear-Symptoms-When-Do-You-Need-Surgery-40a3e2528ece80589950e1ea9dcfd1b0?source=copy_link