Medically reviewed by Dr. David L. Greenwald, MD, FAANS, FACS — dual board-certified spine surgeon & neurosurgeon. Last reviewed October 2026.

Spinal fusion permanently joins two or more vertebrae so they move as one — eliminating the painful, abnormal motion caused by instability, slippage, or a worn-out segment. It's a time-tested way to restore stability and relieve pain when the spine can no longer hold itself together.

What Is Spinal Fusion?

Spinal fusion is a procedure that permanently joins two or more vertebrae into a single, solid segment of bone. When a level of the spine moves abnormally — because it's slipping, worn out, or unstable after injury — that extra motion pinches nerves and generates pain with every step and bend. Fusion stops the motion at that one level, so the pain stops with it.

To do this, the surgeon places a bone graft between the vertebrae and secures the segment with small screws, rods, or a spacer while the body heals. The graft gives your own bone a scaffold to grow across; the hardware simply holds everything still so that growth can happen. Over the following months, the graft and your bone knit together into one continuous unit — a biological weld that holds for life. Fusion can be performed in the neck (cervical), the mid-back (thoracic), or the lower back (lumbar), and it's frequently paired with a decompression that first relieves pressure on the crowded nerves before the segment is stabilized — so the same operation both frees the nerve and steadies the spine.

At Desert Spine and Pain, fusion is never the starting point. Most back and neck problems improve with conservative care and interventional pain procedures, and we exhaust those first. When a segment is truly unstable, though — and nothing short of stabilizing it will stop the pain — fusion, done well, can end a problem that nothing else has touched. Because Dr. Greenwald is both a spine surgeon and a neurosurgeon, the bone, the disc, and the delicate nerves around them are all handled by one expert.

Our Fusion Procedures

Most people searching for "spinal fusion" don't yet know which specific procedure they need — and that's exactly what the consultation is for. Fusion is a family of operations, each matched to where the instability lives in your spine. These are the main approaches we perform:

When Is Spinal Fusion Needed?

Fusion is the right answer in a specific set of situations — when a segment has lost its stability and that instability is the source of the pain. You may be a candidate for spinal fusion when:

• Conservative care hasn't worked. Pain that persists despite several weeks to months of physical therapy, medication, and image-guided injections, with imaging that confirms the problem.
• A vertebra is slipping. Spondylolisthesis — where one vertebra slides forward over the one below — is one of the most common reasons fusion is recommended.
• The segment is unstable or deformed. Instability from degenerative disc disease, scoliosis, or progressive curvature that's driving the pain.
• A fracture has destabilized the spine. A spinal fracture — often after a fall or car accident — can leave a segment unable to bear load safely.
• A disc problem keeps coming back. A recurrent herniation, or a stenosis that requires removing so much bone to decompress the nerves that the segment would be left unstable.

Just as important is knowing when fusion isn't the answer. People without true instability often do better with a less-invasive option, and factors such as smoking or poor bone quality are weighed carefully because they affect how well the fusion will heal. Dr. Greenwald tells you honestly which category you fall into.

Fusion Only When It's Truly Needed

Fusion is powerful, but it's not for every back problem — and we never recommend it lightly. When a segment is genuinely unstable or slipping, fusion is the right answer; when it isn't, a decompression or a motion-preserving option may serve you better. Because Dr. Greenwald performs all of these, his recommendation reflects what your spine needs, not a single specialty's toolkit. Wherever possible, fusions are done with minimally invasive, muscle-sparing techniques.

The Minimally Invasive Advantage

When your anatomy allows, Dr. Greenwald performs fusion through small incisions using a tubular retractor that gently spreads the muscle instead of cutting through it, and places the graft and hardware through those small openings. Compared with traditional open fusion, a minimally invasive approach generally means less blood loss, less post-operative pain, a shorter hospital stay, and a faster return to activity. The target of the operation is identical — a solid, stable fusion — but the path to it disturbs far less of the surrounding tissue, which is a large part of why many patients are up and moving so quickly afterward. Whether a minimally invasive approach is right for you depends on which level is being fused, how many levels are involved, and your individual anatomy; Dr. Greenwald's dual training as a spine surgeon and neurosurgeon means he can judge that honestly and handle both the bony work and the nerves through those small openings. Not every fusion can be done this way, but when it can, it's our first choice.

What to Expect — From Consultation to Recovery

Deciding on fusion should never feel rushed or one-sided. Here's how the process works at Desert Spine and Pain:

• Consultation & imaging. Dr. Greenwald reviews your history, examines you, and studies your MRI, CT, or X-rays to confirm that instability — not something a lesser procedure could fix — is the true source of the problem.
• An honest recommendation. You'll hear whether fusion is genuinely warranted, and if a decompression alone or a motion-preserving option could work instead, we'll tell you.
• The procedure. Your fusion is performed by Dr. Greenwald at an accredited affiliated surgical facility, using the least-invasive technique that will fully stabilize the segment.
• Recovery & follow-up. You're given a clear, personalized recovery plan and seen in follow-up — including imaging over time — to confirm the bone is healing into a solid fusion.

Recovery & Getting Back to Life

Fusion recovery happens in two phases. The first is the early recovery from the surgery itself: after a minimally invasive fusion, many patients are up and walking the same day or the next, go home within a few days, and gradually ease back into light activity over the following weeks, with heavy lifting and twisting restricted at first. The second phase is the fusion itself healing — because fusion works by growing new bone, the segment continues to solidify over several months. You'll increase activity on a schedule built around that timeline, and Dr. Greenwald confirms the fusion is taking hold at your follow-up visits. Most patients return to the activities they love once the bone is solid; your personalized plan spells out exactly what to expect at each stage, including when you can drive, return to work, and resume exercise. Staying active within your restrictions, following your physical-therapy plan, and avoiding smoking all help the fusion heal well — and our team is a phone call away the whole way through.

Insurance, Out-of-Network & Cost

We welcome out-of-network patients of every kind and you don't need a referral to be seen. Our team verifies your coverage and explains any out-of-pocket costs before anything is scheduled, so there are no surprises. Because many of our fusion patients come to us after a car accident or injury, we also coordinate closely with personal-injury attorneys and offer 24/7 concierge support for accident-related spine surgery.

Proudly Serving the Greater Phoenix, Arizona Area

Why Choose Our Fusion Surgeon in Phoenix

Your fusion is performed by a dual board-certified spine surgeon and neurosurgeon who offers fusion, decompression, and motion-preserving alternatives — so you get the right operation, not the only one on the menu. It's a dual qualification few surgeons in Phoenix hold, and one that matters most when nerves are involved. We welcome out-of-network patients, require no referral, and coordinate with personal-injury attorneys for accident-related spine surgery.

Spinal Fusion: Frequently Asked Questions