Chen, Wen-Jer. “Increased Risk of Dislocation With Collar Reinforced Modular Heads of the Lubinus SP-2 Hip Prosthesis”. Acta Orthopaedica 67, no. 2 (January 1, 1996): 204–210. Accessed May 5, 2026. https://actaorthop.org/actao/article/view/21020.