Magnetic resonance imaging of the postoperative lumbar spine.

Magnetic resonance (MR) imaging is a powerful diagnostic tool for patients with the failed back surgery syndrome. The multiplanar imaging capability, superior soft-tissue contrast resolution, and excellent tissue characterization are its major advantages. It displays the changes caused by surgical intervention as well as associated postoperative findings, many of which cause the failed back surgery syndrome. Most recently, gadolinium-DTPA-enhanced MR imaging of the spine, combined with noncontrast MR imaging, has shown heretofore unparallelled sensitivity and accuracy.