E A E J Mirjam de Winter, W, Rhijn Feith, and Corné J M van Loon. “The Richards Type II Patellofemoral Arthroplasty: 26 Cases Followed for 1-20 Years”. Acta Orthopaedica 72, no. 5 (January 1, 2001): 487–490. Accessed February 23, 2025. https://actaorthop.org/actao/article/view/20099.