[KMFTR (Kotz Modular Femur Tibia Reconstruction System) modular tumor endoprosthesis system for the lower extremity]

206 patients with tumorendoprosteses of the KMFTR-type at the lower extremity were operated at the Institute Rizolli Bologna and at the University Clinic of Vienna. The minimum follow up was 2 years (mean 3.2, max. 8 years). In order to bridge the defect caused by tumor resection the proximal femur was replaced in 42 cases, the distal femur in 119 cases and in 6 patients a total femur prosthesis was used. The proximal tibia was replaced in 35 cases and in 4 cases a total knee prosthesis was implanted. Clinical evaluation according to Enneking revealed 71.6% excellent and good results. In 83.4% the radiological score was higher then 20. We saw deep infections in 8.2% (17 patients), breakage of the prosthesis in 6.8% and aseptic loosening in 5.8%. 3 patients had to be amputated due to infection. In the remaining cases of infection in 66% of the patients healing was observed. All cases of aseptic loosening or breakage could be revised successfully by an exchange of the prostheses and therefore salvage of the leg was achieved.