With spinal disc degeneration, the disc flattens out. And in some cases, the loss of height can be offset by inserting a so called “spacer” in between the back of the vertebral body and the adjacent spinous processes. The spacer expands the distance between the spinous processes as near as possible to the vertebral body. This should somewhat straighten the spine and extend the lateral nerve canals as well as the spinal canal.
Advantage: Only an minimally invasive procedure necessary. The small implants can be inserted from the back without having to open the spinal canal or separating the ligaments.
However, the spacer can only achieve a fixed change in the spinal posture in its given section. Due to the minimally invasive approach, restricting bone mass is not removed. Therefore, this method is not suitable for all cases of spinal canal stenosis.