Petschnig, Renate, Ramon Baron, Rainer Kotz, Peter Ritschl, and Alfred Engel. 1995. “Muscle Function After Endoprosthetic Replacement of the Proximal tibia:Different Techniques for Extensor Reconstruction in 17 Tumor Patients”. Acta Orthopaedica 66 (3):266-70. https://doi.org/10.3109/17453679508995539.