Management of complex lumbosacral neoplastic disease presents unique challenges and requires a multidisciplinary approach. Large pelvic tumors may require external hemipelvectomy where an entire lower extremity including the hemipelvis is removed with disarticulation of the sacroiliac joint and symphysis pubis. When external hemipelvectomy is performed, the reconstructive surgeon must consider osseous reconstruction for structural pelvic support, the elimination of dead space, protection of implanted hardware, intra-abdominal support, and skin coverage. Reconstruction must minimize wound healing morbidity, operative time and the number of operative sites, and maximize the potential for rehabilitation. We present a case demonstrating use of a rotational chimeric flap for the reconstruction of an external hemipelvectomy defect.