Dobrydnjov, Igor, et al. “Intraarticular Vs. Extraarticular Ropivacaine Infusion Following High-Dose Local Infiltration Analgesia After Total Knee Arthroplasty”. Acta Orthopaedica, vol. 82, no. 6, Dec. 2011, pp. 692-8, doi:10.3109/17453674.2011.625535.