Fig. 1

a, b X–ray of the patient who was recently underwent revision surgery, suggested aseptic loosening at the femur side 7 years after limb-salvage surgery. c Digital tomosynthesis (DTS) of the femur showed prosthesis stem aseptic loosening. d Digital tomosynthesis (DTS) of the proximal tibia showed no tibial component loosing. e Pictures of the APT component during revision surgery showed the APT component without obvious wear