Posterior Cervical Fusion

Overview

A posterior cervical fusion is a surgery performed through a small incision in the back of the neck. The surgeon removes bone or tissue that is compressing the spinal cord or nerves, then places screws into the lateral masses, the bony pillars on either side of the spinal canal, and connects them with rods running along the length of the treated segment. Bone graft is packed along the joints to encourage the vertebrae to grow together into a single solid piece over the following months. This is often called a posterior cervical laminectomy and fusion, since decompressing the spinal canal (laminectomy) and stabilizing the spine (fusion) are usually done together in the same operation.

The posterior approach is chosen instead of the more familiar front-of-the-neck (anterior) approach in specific situations: when several levels need to be decompressed at once, when the natural curve of the neck is still reasonably well aligned, or when a prior anterior surgery needs a second, supporting operation from behind. It is one of the more established techniques in spine surgery, with a long track record for treating multilevel cord compression safely.

When it's recommended

The most common reason for this surgery is cervical myelopathy, spinal cord compression from degenerative changes such as bone spurs, thickened ligament, or a calcified posterior longitudinal ligament (OPLL) that has narrowed the canal over several levels. Posterior fusion is generally favored over an anterior approach when three or more levels are compressed, when the compression comes mainly from behind the cord (as with thickened ligament), and when the neck is not significantly bent forward (kyphotic), since a posterior operation works best when the spinal cord has room to shift backward, away from the compression, once it is decompressed. It is also used for cervical instability, such as a vertebra that has slipped out of alignment, for severe facet joint arthritis causing pain that has not responded to non-surgical treatment, and to revise or supplement a previous fusion that has not healed solidly.

The decision between an anterior and posterior approach, or a combination of both, depends on how many levels are involved, where the compression is coming from, the overall alignment of the neck, and the patient's individual anatomy and health. Your surgeon will walk through why this approach fits your specific imaging and symptoms.

How it works

Under general anesthesia, the patient is positioned face-down with the head carefully secured to protect the neck during the operation. The surgeon makes an incision down the middle of the back of the neck and moves the muscles aside to reach the spine without cutting them. Any bone or ligament pressing on the spinal cord or nerve roots is removed to create more room, which is the decompression, or laminectomy, part of the procedure.

Once the canal is decompressed, screws are placed into the lateral masses at each level being treated (occasionally pedicle screws are used at certain levels for added strength), and rods are attached to connect the screws into one rigid construct. Bone graft, either from the patient's own hip or a bone bank, along with substitutes that encourage bone growth, is placed along the exposed bone surfaces. Over the following months, the body grows new bone across the graft, fusing the treated vertebrae into a single stable segment while the titanium hardware holds everything in place during that healing process. The operation typically takes a few hours, with the exact length depending on how many levels are treated.

Preparing for the procedure

Before surgery, expect a physical exam, updated imaging (MRI and often CT to plan screw placement), and standard pre-operative bloodwork. Your surgeon will review your medications, since blood thinners, certain supplements, and some anti-inflammatory drugs typically need to be paused beforehand, and will ask about smoking, since tobacco use significantly slows bone fusion and increases the risk of the graft not healing solidly. Managing blood sugar if you have diabetes and optimizing nutrition also support healing.

Practical preparation makes recovery smoother. Arranging for someone to drive you home and help for the first days, setting up a recovery space that avoids the need to bend, twist, or reach overhead, and, if recommended, obtaining a cervical collar in advance are all worth doing ahead of time. Your care team will also discuss what to expect on the day of surgery, including anesthesia and typical hospital stay, which is usually a few days depending on the extent of the surgery and your overall health.

Recovery and aftercare

Most patients are encouraged to walk with assistance on the day of surgery or the day after, and pain is managed with a combination of medications that is tapered as healing progresses. A soft or rigid cervical collar may be used for comfort and support in the early weeks, based on your surgeon's preference and the extent of your fusion. Incision care, gradually increasing activity, and avoiding heavy lifting, twisting, and high-impact activity are all part of early recovery, typically for around three months, while the fusion becomes more solid.

Bone continues to consolidate for six months to a year, and follow-up visits with X-rays check that the hardware is in good position and that fusion is progressing as expected. Physical therapy is commonly introduced once the surgeon confirms it is safe, to rebuild neck and shoulder strength and restore function in the segments above and below the fusion. Most people return to light daily activities within a few weeks and resume most normal activities, including work for many desk-based jobs, within one to three months, though this varies with the number of levels fused and individual healing.

Risks and considerations

As with any spine surgery, general risks include infection, bleeding, blood clots, and reactions to anesthesia. Risks more specific to posterior cervical fusion include a temporary weakness in the shoulder or upper arm known as C5 palsy, which occurs in a meaningful minority of patients after posterior decompression and typically improves substantially over weeks to months with therapy. Other possible issues include hardware-related complications such as screw loosening or rod fracture, particularly with fusions spanning several levels, a fusion that fails to heal solidly (pseudarthrosis) and may need revision, and, less commonly, a cerebrospinal fluid leak, wound-healing problems, or a change in the natural curve of the neck over time.

Fusion permanently stops motion at the treated levels, and there is a long-term possibility that the segments just above or below the fusion take on extra stress and degenerate faster, sometimes called adjacent segment disease. Your surgical team will discuss which of these risks are most relevant to your case based on the number of levels involved, your bone quality, and your overall health, and will outline the warning signs, such as fever, worsening weakness, or new bowel or bladder symptoms, that should prompt an urgent call to your surgeon rather than waiting for a scheduled follow-up.