Spinal Fusion Surgery

What is spinal fusion surgery?

Spinal fusion surgery is the most common surgical treatment for severe scoliosis in adolescents. Severe scoliosis is defined as a curve of 45 degrees or more. Spinal fusion surgery is also used to treat severe kyphosis (defined as a curve of 75 degrees or more), spinal fractures, and other spinal abnormalities.

The goal of spinal fusion surgery is to correct the curvature, stabilize the spine, and, in the case of scoliosis and kyphosis, prevent further curvature of the spine. Stabilizing the spine can also restore lung function, improve mobility, and reduce pain.


How does spinal fusion surgery work?

During spinal fusion surgery, the surgeon stabilizes the curved section of the spine with spinal instrumentation and bone grafts.

  • Instrumentation refers to the metal rods, hooks, and screws that surgeons attach to the abnormally curved section of the spine in order to stabilize it in an upright position.
  • Bone grafts are small bone chips that the surgeon packs around the abnormal vertebrae. This encourages this section of the spine to heal into a solid bone. This process is similar to the natural healing process of a broken bone. The bone graft may be taken from the patient’s local bone during surgery or it may come from the hospital’s bone bank.

Fused bone after spinal fusion surgery.

Recovery from spinal fusion surgery usually takes six to 12 months. Once the bone has fused, the abnormal section of the spine will not curve further. The instrumentation usually remains in the spine without causing problems.

What are the different types of spinal fusion surgery?

Posterior fusion, in which the spine is operated on from behind, is the most common surgery for idiopathic scoliosis and neuromuscular scoliosis. After the patient receives anesthesia and has gone to sleep, they are gently rolled onto their stomach and an incision is made on their back.

  • Most patients with idiopathic scoliosis do not need to wear a brace after posterior fusion surgery.
  • Most patients with congenital scoliosis or spondylolisthesis have bone grafts but no instrumentation and need to wear a brace while their spine heals after surgery.

Anterior fusion is more commonly used for congenital scoliosis and kyphosis. It is sometimes used in special instances of idiopathic scoliosis and severe neuromuscular scoliosis. After the patient receives anesthesia and has gone to sleep, an incision is made along a rib or down the side of the abdomen so that the surgeon can attach instrumentation to the spine. After a fusion of this type, patients usually have to wear a brace as their spine heals.

Anterior and posterior fusion is necessary in some special cases. Usually the two surgeries can be done on the same day. But sometimes they must be done in separate operations scheduled one or two weeks apart.

Illustration of patient with severe scoliosis before and after spinal fusion surgery.

What should families expect after spinal fusion surgery?

Different patients recover at different rates from spinal fusion surgery, depending on the type of surgery they had and how much of their spine was involved.

The first few days after surgery

Most patients remain in the hospital for a couple of days after surgery. When they meet certain milestones, like being able to walk, shower, and get dressed on their own, their doctor will discharge them with instructions to continue their recovery at home.

The first few weeks after surgery

Most kids can return to school three to four weeks after spinal fusion surgery. They should not, however, go to gym class or play sports for two to six months, depending on advice from their surgeon.

Six to 12 months after surgery

Within six months to a year, the fused vertebrae will heal into solid, stable bone. This section of the spine will no longer bend or grow beyond its current size. For this reason, most orthopedic surgeons delay spinal fusion surgery, ideally until after a child has reached their mature height. The vertebrae above and below the fused section of spine will continue to move and grow.

Once the patient has been cleared by their doctor, they can return to the activities they enjoyed before surgery. Their doctor may tell them to avoid contact sports like football and rugby.

Learn about our patients and providers

At the age of 2, Everli could barely stand on her own. A year after spinal fusion surgery, she is almost constant motion and resists the end of every recess.

Everli underwent revision surgery at Boston Children