van Susante, Job L C, Pieter Buma, Harry KW Kim, and Robert B Salter. “Traumatic Heterotopic Bone Formation in the Quadriceps Muscle: No Progression by Continuous Passive Motion in Rabbits”. Acta Orthopaedica 67, no. 5 (January 1, 1996): 450–454. Accessed May 25, 2026. https://actaorthop.org/actao/article/view/21022.