Lereim, Paul, Ian Goldie, and Erik Dahlberg. “Hardness of the Subchondral Bone of the Tibial Condyles in the Normal State and in Osteoarthritis and Rheumatoid Arthritis”. Acta Orthopaedica 45, no. 1-4 (January 1, 1974): 614–627. Accessed May 9, 2026. https://actaorthop.org/actao/article/view/29674.