Fig. 1

All patients underwent en bloc resection of tumors, followed by reconstruction with second-generation modular intramedullary segmental prostheses characterized by a lap joint. a Radiograph of the right femur and (B) coronal magnetic resonance imaging of the upper leg of a 74-year-old woman with rectal carcinoma involving the diaphysis of the femur (Patient 16). The yellow arrow in a showing the site of the femoral pathological fracture. The red line in b showing the surgical margin. c En-bloc resection of a malignant bone tumor. d Postoperative radiograph of the femur at 2 months after surgery, showing a stable diaphyseal construction