Anterior Scoliosis Correction (ASC): Non-Fusion Scoliosis Surgery

Last updated on January 19th, 2022 at 06:43 am

Surgical intervention is the greatest fear of parents and patients with scoliosis and should always be a last resort after all conservative approaches have been exhausted. Recently, a robust interest in fusionless scoliosis surgery has encouraged progress in developing various new surgical approaches, innovations, and devices. Get recommendations for living to your fullest potential with scoliosis.

The Origins of Anterior Scoliosis Correction

Vertebral Body Stapling (VBS)

The ASC procedure began with the development of spinal growth modulation surgical procedures in the early 2000s. These initial efforts were vertebral body stapling (VBS) procedures being utilized with early-stage growth cases with progressive scoliosis to modulate asymmetrical spinal growth. The vertebral body staples provided compression on the outer part of the curve. Many patients did have positive outcomes during periods of remaining growth, and the procedure was discontinued for a variety of reasons:

  • Limited window patients could benefit from the procedure
  • Difficulty stabilizing spinal curves during remaining growth
  • Over-correction complications

Although, the vertebral body staples are expected to become available again in coming years for patients with small curves desiring an internal brace, as opposed to wearing an external brace for an extended period.

Vertebral Body Tethering (VBT) Surgery for Scoliosis

Gradually, the concept of using a single cord/tether to “tie” all of the curve segments together and achieve a similar clinical goal as vertebral body stapling was explored and began in 2011. This was used primarily in the thoracic spine to provide a more definite and predictable post-surgical outcome during the remaining growth. This “combo” approach using VBS and VBT also allowed surgeons to begin treating patients with double curves (“S” shaped scoliosis curves) with non-fusion scoliosis surgery procedures. Soon, the advantages of using a cord/tether instead of staples had become clear, and the VBS procedures were discontinued entirely.

While the more powerful and versatile vertebral body tether over vertebral body staples was still very limited to young patients who had very flexible spines and significant growth remaining, the Federal Food & Drug Association (FDA) approved “The Tether – Vertebral Body Tethering System” by Zimmer-Biomet in mid-2019. It is the first approval order for a humanitarian-use device in spinal pediatrics within the last 15 years.

ASC & VBT difference

The primary difference between Anterior Scoliosis Correction procedures and Vertebral Body Tethering procedures is the surgical approach taken by the surgeon. The hardware and tether material are virtually identical. ASC is generally for correcting scoliosis in adults.

What is Anterior Scoliosis Correction (ASC)

To make non-fusion scoliosis surgery available to a larger group of patients, new and innovative surgical techniques have been developed that allow for patients with little or no growth remaining and/or rigid spinal curves an opportunity to be candidates. This can include skeletally maturing, skeletally mature, and even adults with scoliosis. The procedures of VBT or ASC do not need FDA approval themselves. It is the implant device that the company markets that need approval. Anterior Scoliosis Correction surgery cost generally range from $100,000 to $160,000 USD

Additional Read – Not Too Late: How Adults with Scoliosis Can Get Ahead of the Curve

When should ASC be considered?

Surgical procedures of any kind should always be considered a last resort after all nonsurgical scoliosis treatment for adults has been exhausted or proven unsuccessful. Get recommendations for living to your fullest potential with scoliosis. Fusionless scoliosis surgery for adults should only be considered an alternative to scoliosis fusion surgery.

Pros of ASC vs. VBT include:

  • Significantly larger range of curve size (40 degrees to 100+ degrees)
  • More aggressive de-rotational 3D correction
  • Any curve flexibility
  • No additional growth remaining requirement

Anterior Scoliosis Correction Before and After X-Ray

Can the ScoliSMART BootCamp Program Help Improve the Odds of You or Your Child Becoming a Candidate for Anterior Scoliosis Correction?

It may be hard to believe, but the topic of curve flexibility and rigidity is still relatively poorly understood and under-researched in the scoliosis condition.

It is known that curve stiffness is correlated with patient age and curve size but is not necessarily proportional in any given case with any given patient — leaving a huge amount of variability.

While the FDA guidelines for VBT in adolescent patients require to curve flexibility of less than 30 degrees at the curve’s apex, this requirement is unnecessary for ASC. Still, it is generally accepted as a general rule of thumb — and contributes significantly to maximizing outcomes for skeletally mature and adult patients with scoliosis who undergo the Anterior Scoliosis Correction procedure.

Scoliosis is widely known and accepted as a 3-dimensional spinal deformity primarily “driven” by spinal rotation, resulting in a “cool down” effect. This is similar to the “curve” produced by a rubber band when twisted from the top and bottom (see picture).

Spinal Rotation to the Left Forces the Vertebral Body Bending to the Right

The “torsion” created by the “coil down effect” seen as a spinal curvature on x-ray (stemming from the spinal rotation) may be the primary reason for increasing curve rigidity in larger curves.

One peer-reviewed and published case study, in particular, showed a combination of Manipulation Under Anesthesia (MUA) and the ScoliSMART exercises protocols had an encouragingly positive and long-lasting effect on function, range of motion, and curve flexibility.

In addition, anecdotal evidence suggests the ScoliSMART approach for directly targeting, improving, and reducing spinal rotation as a “pre-VBT or ASC preparation program” may be ideal for increasing curve flexibility for patients considering VBT or ASC who do not qualify due to curve rigidity.

Ongoing data collection and evaluation is currently being conducted with the intent of publishing additional clinical data on how specialized scoliosis exercise programs can improve curve flexibility and reduce apex rigidity – enabling more patients to qualify for non-fusion scoliosis surgical procedures like ApiFix, Vertebral Body Tethering, and Anterior Scoliosis Correction.

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