This requires a bone graft to stop the motion at a painful vertebral segment in order to reduce the pain from the joint. The overall aim of the lumbar fusion is to stop the pain at a painful motion segment in the lower back. A lumbar fusion is performed for the pain and disability caused by lumbar degenerative disc disease or a spondylolisthesis . Alongside a spinal fusion, a bone graft procedure, a bone stimulator and a spine surgery instrumentation is typically used.