S. Puri, M. Kashid, G. Shinde, T. Gogia, P. Shrivastava, and S. Dubey, “Outerbridge classification as a predictor for the need of patellar resurfacement in total knee arthroplasty: a prospective study”, Int J Res Orthop, vol. 3, no. 2, pp. 266–270, Feb. 2017.