There are two common forms of Spondylolisthesis; isthmic and degenerative. Spondylolisthesis occurs when there is a weakening of the pars interarticularis. The condition may also be caused by degenerative disc disease. When the vertebra slips forward, it may press on nerves, and surgery may become necessary. Spondylolisthesis may also be caused by degenerative conditions that affect the vertebral facet joints.
Early treatment usually involves rest and medication. Progressive spondylolisthesis may require surgical treatment.