E. Koskinen, A. Eskelinen, P. Paavolainen, P. Pulkkinen, and V. Remes, “Comparison of survival and cost‐effectiveness between unicondylar arthroplasty and total knee arthroplasty in patients with primary osteoarthritis: A follow‐up study of 50,493 knee replacements from the Finnish Arthroplasty Register”, ActaO, vol. 79, no. 4, pp. 499–507, Jan. 2008.