ABSTRACT
Compression of the fifth lumbar nerve root represents one of the most common complaints of patients with lower back pain and sciatica. While this nerve root is commonly involved by a herniated disc or spinal stenosis, the fifth nerve root can be compressed after it leaves the intervertebral foramen and crosses the alla of the sacrum under the lumbosacral ligament (Figure 37.1). This region is commonly known as the lumbosacral tunnel.
