The goal of spinal surgery for scoliosis is to fuse the vertebrae so that the spine cannot bend and to correct deformity. The doctor will try to correct the curve by 50 percent or more.
An assistant from Pediatric Orthopedics at UCSF Children’s Hospital will contact you to schedule the operation. A clinic appointment will be scheduled within a month of the operation date. During the appointment:
The orthopedic surgeon will go over the details of the operation and address your questions or concerns.
X-rays will be obtained if there are no recent films or if additional films are needed.
Your child will be evaluated by the anesthesiologist, who will discuss managing pain both during and after the operation. A general anesthetic is required for spinal fusion. An epidural catheter, a thin flexible tube, may be inserted in the back at the conclusion of the operation to help control pain.
A blood sample will be drawn for analysis, including a blood count.
A nurse will review the hospital admissions and discharge procedures.
An incision is made in the middle of the back. The muscles are moved to the side to expose the spine. The joints between the vertebrae are removed to loosen them up. The vertebrae are roughened up so that the body responds by producing new bone. The new bone eventually bridges the gaps between the vertebrae and makes them fuse together. Metal implants — rods, screws, hooks or wires — are put in to hold the spine still while the vertebrae fuse.
The fusion is augmented with a bone graft. This may be obtained from your child — known as autogenous bone graft and harvested typically from the pelvis — or it can be from a donor — known as allogenous. The advantages of an autogenous bone graft include a more rapid incorporation with the rest of the vertebrae and safety. Disadvantages of an autogenous graft include surgery, which can cause pain and carries its own set of operative risks. The principal risk of an allogenous bone graft is infection, in particular hepatitis at the rate of 1 in 1 million and AIDS at the rate of 1 in 10 million. You will decide whether to go ahead with the surgery after carefully discussing the benefits and risks with the orthopedic surgeon.
Spinal fusion surgery usually takes four to six hours, but the time varies according to the individual child. The surgeons will take as long as they need to do the job well.
The potential complications of surgery include:
- Bleeding — This is controlled by cauterizing bleeding vessels during the operation and by using a device that allows the return of blood lost back to your child at the conclusion of the operation. If it is anticipated that a child will lose a significant amount of blood, and there is a high likelihood for transfusion, your child will be asked to donate two units of blood within the month before surgery.
- Infection — This is a risk whenever the skin is cut for any operation. Sterile precautions are taken in the operating room and your child will be given antibiotics before the operation and for 24 hours after. In addition, the incision is washed with a pressurized system before it is closed.
- Nerve injury — The extent of possible nerve injury can range from a minor injury, such as numbness from compression of a nerve that supplies sensation to the front of the thigh, to a major injury, including paralysis. The risk of major neural injury is well under 1 percent, but it is not zero, so it is essential to have an open and honest dialogue with your orthopedic surgeon about this. The electrical activity of the nerves that transmit signals for sensation and muscle action through the spinal cord is monitored during the procedure. This gives feedback to the surgeon so that the necessary steps can be taken to remedy the problem if it occurs.
- Pseudarthrosis — This means that occasionally — up to 1 percent of the time in children but more often adults — the fusion doesn’t take, or the vertebrae don’t stick together completely. It can take several months or a few years to become apparent. Your child may complain of persistent back pain, there may be progression of the scoliosis after the operation or the implants may fail. When the fusion doesn’t take, over the long term, motion will cause the metal implants to fatigue and ultimately break. The treatment of pseudarthrosis is exploration of the spine, additional bone grafts and replacement of the implants.
Generally, during the first two weeks after the operation, the child shouldn’t go to school or participate in organized activity. This is a time to heal, both physically and mentally. During this time, the dressing on the wound should not be disturbed. This means sponge bathing until the follow-up clinic appointment in two weeks. At the follow-up appointment, the surgeon will inspect of the wound and change the dressing or bandage. Over the course of a year, the child’s activities will return to normal:
- First Six Months — No strenuous physical activity. Activities are limited to “activities of daily living,” meaning personal care, bending and walking. No heavy lifting, meaning nothing heavier than a dinner plate. In addition, no running or jumping is allowed.
- Six to Eight Months — At six months, a physical examination, including X-rays, will be performed. If all is well, more activity, such as swimming, will be allowed.
- Eight to 10 Months — At around eight months your child should do “closed kinetic chain exercises,” which means that the foot is planted or fixed in place as the lower limb moves during exercise. An example is bicycling, where the foot is on a pedal as the lower limb rotates.
- Ten to 12 months — At around 10 months, running, jumping and solo sports are allowed.
At 12 months, the child will visit the surgeon for a third post-surgery appointment. X-rays will be taken. If all is well, your child will be allowed to return to unrestricted activities.