Spinal Fusion Surgery

Certain spinal conditions — such as degenerative disk disease, herniated disks, arthritis of the spine and spinal deformities — can lead to instability or abnormal motion between vertebrae that cause pain. When symptoms persist or worsen despite conservative treatment, spinal fusion surgery may be recommended once spinal instability is clearly identified as the source of pain.

At Houston Methodist, spinal fusion is not a first-line treatment. Our spine specialists start with non-surgical options whenever possible and recommend fusion only when imaging, symptoms and response to prior care indicate spinal instability.

Our specialized team of orthopedic spine surgeons and neurosurgeons work together to help determine whether surgery — and specifically spinal fusion — is the right next step for you.

What Is Spinal Fusion?

Spinal fusion is a surgical procedure that permanently joins two or more vertebrae, eliminating motion at that segment to improve stability and reduce pain. There are several different categories of spinal fusion, each based on the location of the affected vertebrae:

• Cervical Fusion: impacts a vertebra in the cervical (neck) region
• Lumbar Fusion: impacts a vertebra in the lumbar or lower back region
• Thoracic Fusion: impacts a vertebra in the mid-back region

How Does Spinal Fusion Work?

Spinal fusion is typically performed under general anesthesia. During the procedure, your surgeon removes damaged disk or bone material and places a bone graft — either from your body or a donor source — between the affected vertebrae. Rods, screws or plates are then used to hold the spine in proper alignment while the bones heal and fuse together over time.

Fusion may be performed through the front (anterior), back (posterior) or side (lateral) of the body, depending on the condition being treated and the anatomy involved. The goal is to stabilize the spine, eliminate painful motion and relieve pressure on affected nerves. Over time, the bone graft grows and fuses the vertebrae into a single solid segment.

What Conditions Does Spinal Fusion Treat?

Spinal fusion may be used to treat a range of spinal conditions and deformities when non-surgical treatment options have not provided adequate relief. In many cases, patients continue with non-surgical management until symptoms, function or stability change enough to warrant surgery.

Degenerative Disk Disease

Degenerative disk disease is a common, age‑related condition in which spinal disks change over time. Symptoms include low back pain, radiating pain that worsens with bending and numbness in the legs.

Spinal fusion may be considered when disk‑related pain and instability persist despite treatments such as physical therapy and medication.

Herniated Disk

A herniated disk occurs when disk material compresses nearby nerves, causing pain, numbness or weakness. In select cases where instability or recurrent nerve compression is present, fusion may be recommended.

Though a bulging disk is similar, the center of the disk does not break through the disk casing.

Scoliosis/Kyphosis

Spinal fusion is commonly used to treat spinal deformities such as scoliosis and kyphosis. Fusion helps correct abnormal curvature, improve alignment and reduce pain associated with imbalance.

Spinal Stenosis

Spinal stenosis involves narrowing of the spinal canal, which can place pressure on the spinal cord and nerve roots, and can cause pain, numbness or weakness in the lower back and legs.

This condition is commonly driven by age-related changes to the body, such as bone spur formation and thickening ligaments. Fusion may be performed alongside decompression when instability is present.

Spinal Tumors

Spinal tumors can be benign or malignant. Primary spinal cancer is generally considered rare, and most often, spinal tumors are the result of cancer that has metastasized from another location, or from an unrelated condition.

Spinal fusion may be required following removal of certain spinal tumors to restore stability, depending on tumor location and extent of bone involvement.

Spondylolisthesis

Spondylolisthesis occurs when one vertebra slips forward or backward over the one below it, leading to instability and nerve compression. This slippage can be caused by aging, spinal fracture or congenital issues (from birth).

Spinal fusion is often used to stabilize the affected segment and relieve symptoms.

Who Qualifies for Spinal Fusion?

Spinal fusion is typically considered only after conservative, non-surgical treatments have not adequately relieved symptoms. Candidacy depends on factors such as spinal stability, alignment, severity of symptoms and overall health.

Your care team will review imaging tests such as MRI or CT scans, treatment history and symptoms to determine whether spinal fusion offers the safest and most durable option. Fusion is recommended only when imaging, symptoms and response to prior treatments all point to spinal instability as the main source of pain.

When appropriate, your care team will also discuss less invasive or motion‑preserving options and explain why fusion may or may not be recommended. In some cases, a less invasive or alternative surgical approach may be more appropriate.

Preparing for Spinal Fusion Surgery

Preparation begins before the procedure. Your doctor may recommend steps such as:

• Doing pre‑surgical strengthening or conditioning exercises
• Avoiding smoking
• Adjusting medications, including blood thinners
• Preparing your home for recovery
• Planning for post‑surgical support
• Eating a healthy, protein‑rich diet
• Showering with antimicrobial soap before surgery
• Avoiding food and drink after midnight before the procedure

Recovering from Spinal Fusion Surgery

Recovery varies by procedure and individual. Spinal fusion typically requires a longer recovery period than less invasive procedures.

Many patients return to light daily activities within a few months, while full recovery and bone healing can take up to a year. Physical therapy often plays an important role in regaining strength and mobility. Recovery plans include activity restrictions, physical therapy, pain management and gradual return to daily activities.