Wroblewski, B Michael, et al. “Charnley Low-Frictional Torque Arthroplasty in Young Rheumatoid and Juvenile Rheumatoid Arthritis: 292 Hips Followed for an Average of 15 Years”. Acta Orthopaedica, vol. 78, no. 2, Jan. 2007, pp. 206-10, doi:10.1080/17453670710013690.