Fig. 4

Case 24. A case of stage IIB osteosarcoma in distal femur with pathological fracture. a–d Anteroposterior and lateral X-rays before and after neoadjuvant chemotherapy showed significant bone repair at the fracture site during chemotherapy. e Multidimensional osteotomy was performed at the diaphysis of the allograft to enlarge the host–donor junction surface and empty the medullary cavity for cement filling. f The allograft was fixed to the host laterally with a plate spanning the full length of the allograft and was assisted by a short plate anteriorly to the proximal host–donor junction and medially to the distal host–donor junction, respectively. g The postoperative X-ray at 12 months showed that the host–donor junction of the diaphysis and metaphysis had healed, and h the lower limbs were basically equal in length and had normal force lines