When there are signs that pressure is building on the spinal cord, surgery may be required, sometimes right away. Surgeries used to treat spinal stenosis include
- laminectomy
- anterior cervical discectomy and fusion
- corpectomy and strut graft
Laminectomy
The lamina is the covering layer of the bony ring of the spinal canal. It forms a roof-like structure over the back of the spinal cord. When bone spurs or disc contents have pushed into the spinal canal, a laminectomy is done to take off the lamina bone in order to release pressure on the spinal cord.
Some surgeons completely remove the entire lamina bone, called total laminectomy. Others prefer to keep the lamina in place by forming a hinge on one edge of the bone. This hinge is formed by cutting partially through the lamina on one side. A second cut is made all the way through the lamina on the other side. This edge is then lifted away from the spinal cord, and the other edge acts like a hinge. The hinged side eventually forms a bone union, which holds the opposite side open and keeps pressure off the spinal cord.
Anterior Cervical Discectomy and Fusion
A fusion surgery joins two or more bones into one solid bone. Fusion of the neck bones is most often done through the front of the neck. The surgeon takes out the intervertebral disc (discectomy) between two vertebrae. A layer of bone is shaved off the flat surfaces of the two vertebrae to be fused. This causes the surfaces to bleed and stimulates the bone to heal. (This is similar to the way two sides of a fractured bone begin to heal.) A section of bone is grafted from the top part of the pelvis bone and inserted into the space where the disc was taken out. This separates the two vertebra bones, taking pressure off the spinal cord. As the bone graft heals in place, the vertebral bones fuse together into one solid bone.
Corpectomy and Strut Graft
A corpectomy relieves pressure over a large part of the spinal cord. In this procedure, the surgeon takes off the front part of the spinal column and removes several vertebral bodies. The spaces are then filled with bone graft material. Metal plates and screws are generally used to hold the spine in place while it heals. A corpectomy is used in cases of severe spinal stenosis.
No comments:
Post a Comment