Can an acl sprain or even an acl partial tear heal itself ? does a stretched acl recover on its own and become tight again or is it stretched forever?

ACL Reconstruction: Acl tears do not heal on their own; having it replaced can help you maintain a healthy/ active lifestyle in the years to come. The acl is a major knee stabilizer, and can provide security to your knee that may prevent further damage to nearby tendons, ligaments, muscles, articular cartilage, meniscus, & bones when compared to a "loose knee". You may avoid surgery though with a partial tear.