The surgical treatment of tumors near the lumbosacral junction or involving the sacrum is challenging due to the potential for both neurological injury and biomechanical instability postoperatively. The objective of this manuscript is to review the biomechanics and complications of different lumbosacropelvic reconstruction techniques. Standard iliac bolt techniques are reviewed and compared with newer techniques such as S2- alar-iliac screws and minimally invasive techniques. Following resection of tumors in the lumbosacral region, spinopelvic reconstruction is technically feasible and can be accomplished in a biomechanically stable fashion.