Tsuboyama, T., Windhager, R., Dock, W., Bochdansky, T., Yamamuro, T., & Kotz, R. (1993). Knee function after operation for malignancy of the distal femur: Quadriceps muscle mass and knee extension strength in 21 patients with hinged endoprostheses. Acta Orthopaedica, 64(6), 673–677. https://doi.org/10.3109/17453679308994596