Spinal instrumentation is a method of straightening and stabilizing the spine after spinal fusion, by surgically attaching hooks, rods, and wire to the spine in a way that redistributes the stresses on the bones and keeps them in proper alignment. Spinal instrumentation is used to treat instability and deformity of the spine. Instability occurs when the spine no longer maintains its normal shape during movement. Such instability results in nerve damage, spinal deformities, and disabling pain. spinal instrumentation is performed by a neuro and/or orthopedic surgical team with special experience in spinal operations. The surgery is done in a hospital under general anesthesia. It is done at the same time as spinal fusion. Spinal fusion with spinal instrumentation is major surgery. The patient will undergo many tests to determine that nature and exact location of the back problem. These tests are likely to include x rays, magnetic resonance imaging (MRI), computed tomography scans (CT scans), and myleograms. Spinal instrumentation utilizes surgical procedures to implant titanium, titanium-alloy, stainless steel, or non-metallic devices into the spine. Medical implants are specially designed and come in many shapes and sizes. Typically these include rods, hooks, braided cable, plates, screws, and interbody cages. Cages are simply structures that support bones (either between bones or in place of them) while new bone growth occurs through and around them. Spinal instrumentation carries a significant risk of nerve damage and paralysis.