An increasingly popular treatment for early-onset scoliosis is magnetically controlled grow rods like the MAGEC system by NuVasive. Traditionally, grow rods are implanted and attached to a child’s vertebrae. As the child grows, the rods are removed and replaced with longer ones. Unfortunately, using the traditional system, the child may be forced to undergo invasive surgeries as much as every six months.
Magnetically controlled grow rods are different in that the rods do not have to be replaced as the child grows. By using an external remote control, a physician can extend the grow rods every few months by activating a magnetic component embedded in the titanium rods.
The NuVasive MAGEC system is marketed and advertised as safer than traditional grow rods because it requires far fewer surgeries than traditional grow rods which means your child has less exposure to anesthesia, few operations, and faster recoveries.
So, What Could Go Wrong?
Unfortunately, the MAGEC device has been associated with serious adverse events. These events include premature failures, tissue death, revision surgeries and a dangerous condition called metallosis or metal toxicity.
Researchers have been looking into the issues with magnetic grow rods and found some concerning results. In the United Kingdom, researchers found o-ring seal failures, radial bearing damage, and fractured drive pins, leading them to the conclusion that some patients may develop metal toxicity because of these failures.
The European Spine Journal published a study that found considerable internal corrosion and material degradation on device components including the surface of the grow rods. The Spine Journal published a study suggesting magnetically controlled grow rods significantly increased the patient’s risk of unplanned surgeries and metal issues.
What Levels of Metal in the Blood Are Safe for Children?
When metal degradation and corrosion occur, tiny bits of metal ions may be released into the bloodstream where they can travel and settle in different parts of the body. As the levels of metal ions in the body increase, the patient may develop metallosis or metal toxicity.
Unfortunately, not much is known about how much metal in the body is safe for children. What scientists do know is that high levels of metal ions can lead to a series of complications including:
- Hearing issues
- Renal impairment
- Nerve damage
- Thyroid disorders
- Vision problems
- Tissue death
- Pain
- Cognitive impairment
Because so little is known about metallosis in children, scientists have urged caution when considering the device in the treatment of EOS and recommend that all patients who have magnetically controlled grow rods installed have their blood metal levels tested several times a year.
Unplanned Surgeries
Adverse event reports have shown that some children who receive magnetically controlled grow rods may have to have additional, unexpected surgeries to have the device repaired due to breakage or rod lengthening failures, or to have it removed and replaced with other grow rods, or a different system altogether.
If you are considering having magnetically controlled grow rods implanted in your child, be sure to research the device and the latest studies first and talk with your child’s physician to learn more about the experiences they have personally had with the device.