Spinal surgery has also seen great improvements recently. Minimally invasive disc surgery and enhanced spinal fusions for degenerative disorders are significant advances. Spinal instrumentation, i.e., implantable devices used in the surgical treatment of spinal disorders, has been developed and can significantly correct spinal deformities that were previously untreatable. Likewise, rigid spinal fixation by the pedicle screw and other devices and advances in the techniques of vertebrectomy have improved the treatment of cancer patients with spinal metastases or patients with infection. Often, these treatments can result in significant pain relief and neurological recovery.