Patellar dislocation following distal femoral replacement after extra-articular knee resection for bone sarcoma: A case report

Figure 1 Images before the primary surgery. A: Radiograph showing osteolytic lesion in the left distal femur; B: Computed tomography scan also showing the lesion; C and D: The axial radiographic view of computed tomography before the primary operation, line from the middle of the tibial tuberosity (TT) to the bottom of the trochlear groove (TG) is drawn parallel to the posterior condyle line,and the distance between TT and TG is 12.7 mm. TT: Tibial tuberosity; TG: Trochlear groove.