The anterior cruciate ligament (ACL) is the most frequently injured ligament of the knee. Injury causes pain, effusion and inflammation leading to the inability to fully activate the thigh muscles. Regaining muscular control is essential if the individual wishes to return to pre-injury level of function and patients will invariably be referred for rehabilitation.
Trees, A. H., Howe, T. E., Dixon, J., & White, L. (2011). Exercise for treating isolated anterior cruciate ligament injuries in adults. Cochrane Database of Systematic Reviews. https://doi.org/10.1002/14651858.cd005316.pub3