Sacral reconstruction fixation device

A sacral reconstruction fixation device aids in stabilizing the pelvis and the lumbar spine after a sacrectomy in cooperation with a spinal rod and transiliac rod. A pair of the fixation devices may be secured to respective ilia and respective spinal rods. The transiliac rod may be secured to both of the fixation devices. The fixation devices include first and second parts that are initially relatively rotatable about a common axis to aid in connecting the fixation devices to the spinal rod and transiliac rod. The body part is intended to be mated to the spinal rod, while the second part is intended to be mated to the transiliac rod. The fixation device's parts are subsequently locked against rotation and against longitudinal translation, advantageously both relative to each other and the rods.