Kineret® was chosen because it is safe, well tolerated, and has been used to treat Rheumatoid Arthritis (RA) and post-surgical persistent knee effusions as well as knee stiffness. Although Kineret® is approved by the US Food and Drug Administration (FDA) for the treatment of RA and Neonatal-Onset Multisystem Inflammatory Disease, it is not currently approved by the FDA for use in treating ACL injury. Therefore, the use of Kineret® in this study is investigational.