Fusion of the 5th (lowest) lumbar vertebra with the upper sacrum.
It may be present at birth, in which there are usually no symptoms.
Surgery may be performed to treat a disc prolapse or spondylolisthesis.
(See also spinal fusion.)
It may be present at birth, in which there are usually no symptoms.
Surgery may be performed to treat a disc prolapse or spondylolisthesis.
(See also spinal fusion.)