Fusion itself within an ACDF surgery is generally intended to be permanent. Bone fuses to bone and does not wear out, meaning that a successfully fused spinal level is designed to remain stable for the rest of a patient’s life.
The core ACDF longevity question is less about whether the fusion construct itself will “come apart” and more about how the adjacent levels of the spine respond to the fusion over the following years and even decades.
Is ACDF a Permanent Procedure?
During an ACDF surgery, the bone graft that is placed between the vertebrae generally integrates with the surrounding bone, typically over a period of 6-12 months. Over time, a solid bony union is formed between the vertebrae. A successfully healed fusion is generally intended to be permanent, meaning the fused spinal level is designed to remain stable for the rest of the patient’s life.
Additionally, the plate and screws used during ACDF serve as a stabilizing scaffold while the fusion develops. Once the bone has successfully fused, the vertebrae themselves provide the primary structural stability, although the hardware remains in place and may continue to provide support. Decompression (i.e., removing the disc that was pressing on nerves/spinal cord) is also accomplished, and with the disc now gone, re-herniation cannot take place.
Decompression (removing the damaged disc material that was pressing on nerves or the spinal cord) is also accomplished during surgery. Because the original disc is removed, that disc cannot re-herniate. However, adjacent discs above or below the fusion can still develop herniations or degenerative changes over time.
An important consideration is that not every ACDF results in a successful bone fusion. In some patients, the vertebrae do not fully unite, a condition known as pseudarthrosis or nonunion. When this occurs, the intended permanent fusion has not been achieved, and patients may experience persistent pain, instability, or other symptoms. Some cases may require additional treatment or revision surgery.
Overall, ACDF has demonstrated favorable long-term outcomes, with many patients experiencing meaningful and lasting symptom relief. However, long-term success depends on several factors, including successful bone fusion, the number of levels treated, and the condition of the surrounding spinal segments. A successful fusion does not prevent the natural aging and degeneration of the remaining cervical spine.
What Is Adjacent Segment Disease, and Should You Be Worried?
When one segment of the cervical spine is fused, adjacent segments below and above it will absorb more motion than before. As a result, this increased mechanical demand can accelerate degenerative changes within those levels over time.
This is called “adjacent segment disease” (ASD) and represents a different long-term concern from the fusion itself failing. With ASD, the fused level remains stable, but neighboring levels can develop new symptoms and degenerative changes of their own.
ASD is a recognized long-term risk of ACDF surgeries; however, it’s worth noting that the vast majority of ACDF patients don’t develop symptomatic ASD to the degree that treatment is required.
That said, when adjacent segment symptoms do develop, they usually occur several years (usually a decade or more) after the surgery, and rarely in the near term. ASD itself is also detectable on imaging during follow-ups, meaning that degenerative changes can often be monitored and identified. This is another reason why ongoing monitoring matters for protecting the long-term health of your cervical spine.
What Factors Increase the Risk of Adjacent Segment Disease?
Ultimately, there are several different variables that play into whether ASD will develop over time. These include:
- The number of levels fused (generally speaking, the more fused levels that you have, the more adjacent stress your neighboring spinal segments will experience).
- Patient’s age at the time of surgery (younger patients have longer exposure to mechanical loads on adjacent levels over decades).
- Smoking (this is directly associated with worse fusion quality, as well as successful ACDF long-term outcomes).
- Osteoporosis and overall bone health.
- Pre-existing degenerative changes at adjacent levels before surgery.
What Can You Do to Protect Your ACDF Results Long-Term?
The good news is that there are several steps that patients can take to support their spine and protect their surgical results over time, including:
- Continuing physical therapy to maintain strength and flexibility gains from rehabilitation. Having a strong supporting musculature reduces stress on adjacent levels and can help promote healthy movement mechanics.
- Avoiding prolonged forward neck flexion (e.g., looking down at phones for extended periods of time, working a poorly positioned computer screen, etc.). This kind of repetitive posture is common, but can load cervical segments unevenly, something that is especially relevant for anyone with a cervical fusion.
- Avoid smoking. Statistically, smoking is directly associated with impaired fusion, as well as accelerated adjacent segment disease after ACDF. Cessation from smoking before and after surgery is one of the highest-impact things a patient controls in terms of actively supporting their long-term spinal health.
- Attend all follow-up appointments. Adjacent segment changes are generally detectable on imaging long before they become symptomatic, providing patients and their care teams the option to act early. That’s why it’s important to continue follow-up even when your recovery is going well.
- Maintain a healthy weight in order to reduce the mechanical load on the cervical spine.
Why Does Surgeon Experience Matter for Long-Term Outcomes?
Surgical expertise and technique have a direct influence on long-term outcomes, especially when performing procedures that involve the delicate structures of the cervical spine, like ACDF. Proper surgical planning, precise decompression, and restoration of cervical alignment can all play an important role in maintaining spinal stability and reducing stress on adjacent segments.
This is where depth of training matters, and having a highly experienced neurosurgical care team can make a big difference. Neurosurgeons receive extensive specialized training in the brain, spinal cord, nerve roots, and peripheral nervous system, providing a comprehensive understanding of the neurological structures involved in cervical spine surgery. This expertise is particularly valuable when addressing spinal cord compression, nerve impingement, and other conditions in which protecting neurological function is a primary concern.
Although both neurosurgeons and orthopedic spine surgeons perform ACDF, their foundational training differs. Neurosurgeons bring a specialized neurological perspective to the procedure, while orthopedic spine surgeons have a foundation in the musculoskeletal system, including bones, joints, and spinal biomechanics. For patients undergoing cervical spine surgery, having a surgeon with extensive neurosurgical training and significant experience in complex cervical procedures can provide an important level of expertise in protecting and preserving neurological function.
Ultimately, the surgeon’s specific experience, training, and expertise in cervical spine procedures are essential considerations when evaluating who should perform your surgery.
This is where Goodman Campbell comes in. As a global leader in brain and spine care and a leading center for neurosurgical research and training, we bring decades of specialized neurosurgical experience to every patient we treat. With Goodman Campbell, our patients also have direct access to their care team for long-term follow up and ongoing imaging monitoring, which is part of how we protect your results over time.
Interested in learning more about how Goodman Campbell can help you find the right treatment? Request a consultation or call us directly at 317-396-1300.
