What Is Spinal Fusion?
Spinal fusion is a surgical treatment during which two or additional vertebrae are for good joined into one solid bone with no area between them. Vertebrae are the tiny, interlocking bones of the spine.
In spinal fusion, extra bone is used to fill the area that sometimes exists between the two separate vertebrae. once the bone heals, there’s no longer area between them.
Spinal fusion is also known as:
- anterior spinal fusion
- posterior spinal fusion
- vertebral interbody fusion
Uses of Spinal Fusion
Spinal fusion is performed to treat or relieve symptoms of many spinal problems. The procedure removes mobility between the two treated vertebrae. This may decrease flexibility, but it’s useful for treating spinal disorders that make movement painful. These disorders include:
- spinal stenosis
- herniated “bulging” disks
- degenerative disk disease
- fractured vertebrae that may be making your spinal column unstable
- scoliosis (curvature of the spine)
- kyphosis (abnormal rounding of the upper spine)
- spinal weakness or instability due to severe arthritis, tumors, or infections
- spondylolisthesis (a condition in which one vertebra slips onto the vertebra below it, causing severe pain)
A spinal fusion procedure may also include a diskectomy. When performed alone, a diskectomy involves removing a disk due to damage or disease. When the disk is removed, bone grafts are placed into the empty disk space to maintain the right height between bones. Your doctor uses the two vertebrae on either side of the removed disk to form a bridge (or fusion) across the bone grafts to promote long-term stability.
When spinal fusion is performed in the cervical spine along with a diskectomy, it’s called cervical fusion. Instead of removing a vertebra, the surgeon removes disks or bone spurs from the cervical spine, which is in the neck. There are seven vertebrae separated by intervertebral disks in the cervical spine.
Preparing for Spinal Fusion
Typically, the preparation for spinal fusion is like other surgical procedures. It requires preoperative laboratory testing.
Before spinal fusion, you should tell your physician about any of the following:
- cigarette smoking, which may reduce your ability to heal from spinal fusion
- alcohol use
- any illnesses you have, including colds, the flu, or herpes
- any prescription or over-the-counter medications you’re taking, including herbs and supplements
You’ll want to discuss how the medications you’re taking should be used before and after the procedure. Your doctor may provide special instructions if you’re taking medications that could affect blood clotting. These include anticoagulants (blood thinners), such as warfarin, and nonsteroidal anti-inflammatory drugs (NSAIDs), including aspirin and ibuprofen.
You’ll be given general anesthesia, so you’ll need to fast for at least eight hours before your procedure. On the day of surgery, use only a sip of water to take any medications your physician has recommended.
How Is Spinal Fusion Performed?
Spinal fusion is performed in the surgical department of a hospital. It’s done using general anesthesia, so you won’t be conscious or feel any pain during the procedure.
During the procedure, you’ll be lying down and have a blood pressure cuff on your arm and heart monitor leads on your chest. This allows your surgeon and anesthesia provider to monitor your heartbeat and blood pressure during surgery. The whole procedure may take several hours.
Your surgeon will prepare the bone graft that will be used to fuse the two vertebrae. If your own bone is being used, your surgeon will make a cut above the pelvic bone and remove a small section of it. The bone graft may also be a synthetic bone or an allograft, which is a bone from a bone bank.
Depending on where the bone will be fused, your surgeon will make an incision for placement of the bone.
If you’re having a cervical fusion, your surgeon will often make a small incision in the horizontal fold of the front of your neck to expose the cervical spine. The bone graft will be placed between the affected vertebrae to join them. Sometimes, the graft material is inserted between the vertebrae in special cages. Some techniques place the graft over the back part of the spine.
Once the bone graft is in place, your surgeon will may use plates, screws, and rods so that the spine won’t move. This is called internal fixation. The added stability provided by the plates, screws, and rods helps the spine to heal faster and with a higher rate of success.
Complications of Spinal Fusion
Spinal fusion, like any surgery, carries the risk of certain complications, such as:
- blood clots
- bleeding and blood loss
- respiratory problems
- heart attack or stroke during surgery
- inadequate wound healing
- reactions to medications or anesthesia
Spinal fusion also carries the risk of the following rare complications:
- infection in the treated vertebrae or wound
- damage to a spinal nerve, which can cause weakness, pain, and bowel or bladder problems
- additional stress on the bones adjacent to the fused vertebrae
- persistent pain at the bone graft site
- blood clots in the legs that can be life-threatening if they travel to the lungs
The most serious complications are blood clots and infection, which are most likely to occur during the first weeks following surgery.
Contact your doctor or seek emergency help if you experience any of theses symptoms of a blood clot:
- a calf, ankle, or foot that suddenly swells
- redness or tenderness above or below the knee
- calf pain
- groin pain
- shortness of breath
Contact your physician or seek emergency help if you experience any of the following symptoms of infection:
- swelling or redness at the edges of the wound
- drainage of blood, pus, or other liquid from the wound
- fever or chills or elevated temperature over 100 degrees
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