Robertsson, Otto, Michael Dunbar, Kaj Knutson, Stefan Lewold, and Lars Lidgren. “Validation of the Swedish Knee Arthroplasty Register: A Postal Survey Regarding 30,376 Knees Operated on Between 1975 and 1995”. Acta Orthopaedica 70, no. 5 (January 1, 1999): 467–472. Accessed May 16, 2026. https://actaorthop.org/actao/article/view/20461.