Injectable hydrogel treats back pain from damaged discs in human trials

Jennifer E. Engen

Human trials have shown that hydrogel injections are a promising, effective treatment for chronic lower back pain caused by degenerative disc disease (DDD). The treatment is far less invasive than other surgeries, and has been given FDA approval.

Spinal discs play an important role in cushioning the vertebrae, but as with many parts of the body they begin to wear out with age. In many people, the fluid filling of the discs can dry up or leak out, causing pain and affecting mobility. Unfortunately, treatments are largely limited to care like rest, physical therapy and painkillers, or in more severe cases, surgery where discs are removed or replaced with prosthetics.

But recently, scientists have developed a new option – a hydrogel that can be injected into the spine where it fills in cracks and tears in the affected disc, restoring some of its cushioning to alleviate pain. Developed by the medical company ReGelTec, the gel is known as Hydrafil, and in 2020 it received a Breakthrough Device designation from the US FDA. And now the results of the first human trials are in.

The trial involved 20 patients aged between 22 and 69, all of whom had chronic lower back pain from DDD. They had all described their pain as four or higher on a 10-point scale, and all had reported only mild relief from existing therapies.

First, the gel is heated so that it becomes a thick liquid, which is then injected using a 17-gauge needle into the affected discs. When it cools to body temperature, it forms an implant with the same kind of biomechanical properties as the natural disc. The patients were then followed for six months to assess their recovery.

And sure enough, all participants reported improvements to pain and mobility. On a scale of 0 to 10, the average pain level reported fell from 7.1 to 2.0. On a questionnaire about how their lower back pain prevented them from performing everyday activities, their average score fell from 48 down to six.

“If these findings are confirmed in further research, this procedure may be a very promising treatment for chronic low back pain in those who’ve found insufficient relief from conservative care,” said Douglas Beall, lead author of the study. “The gel is easy to administer, requires no open surgery, and is an easy procedure for the patient.”

Of course, this first trial was small, and 20 patients isn’t enough to make any big claims just yet. But the treatment does show promise, and the team will continue testing with more patients.

The research will be presented at the Annual Scientific Meeting of the Society of Interventional Radiology next week.

Source: Eurekalert

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