A new gel injected into damaged discs has produced promising early results, and a viral post claims the same for neck pain. Here is what the evidence actually shows.
There has been a good deal of interest recently in the idea that a gel injected into a worn disc might essentially give you a new one. Alongside it, a post has gone viral on social media claiming a similar substance can be injected into the discs of the neck to cure neck pain. Both deserve a careful look, because one is real research and the other is not.
First, how a disc is built
The spine is a stack of bones called vertebrae, running from deep within the pelvis up to the skull. Between each one sits a soft cushion that acts as a shock absorber. That is the disc.
Look closely and a disc has two parts:
- The nucleus, the inner shock-absorbing substance. Its consistency is remarkably like crab meat, which is how many textbooks describe it.
- The annulus, the outer lining that holds the nucleus in place, rather like layers upon layers of fabric.
Over time that outer fabric can wear thin and some fluid leaks out. The inner nucleus may bulge, or herniate out of the disc space altogether, and the disc space itself gradually thins.
This is a common finding and entirely normal with age, including in people who have no back pain whatsoever. In a small number of people, though, a secondary inflammatory response develops around the end plates, the bony margins either side of the disc, and studies have shown this can be a cause of chronic lower back pain.
What the gel is, and what the studies showed
Researchers have developed Hydrafil, a thick, gel-like substance that can be injected into the disc space to replicate the properties of the nucleus.
The sequence of research so far:
- In 2023, a series of 20 patients underwent the injection, primarily to test its safety.
- In 2025, the procedure was carried out on 60 patients. Five of those required surgery to remove the gel because of complications. Among the remainder there was significant improvement in overall back pain, sustained at two-year follow-up.
The complications are worth understanding
All five were the same problem. The injected material leaked through a defect in the annulus, the outer lining, compressing a nerve and worsening the patient’s pain. Each needed an operation to remove it, essentially a microdiscectomy.
This gets to the heart of the difficulty. The very reason a disc has degenerated is that its outer lining has thinned, which is precisely what allows injected material to escape.
In fairness to the researchers, these leaks occurred among the earlier patients. They subsequently reassessed everyone being considered for the study with MRI scans, examining the integrity of that outer lining, and only injected those in whom it appeared relatively intact. This is a reasonable approach, because a torn annulus can repair itself over time with scar tissue.
Now, the neck claim
A post went viral suggesting a similar substance could cure neck pain. Having researched this extensively, as have others in the spine profession, I can tell you plainly: that study does not exist. The post is fabricated. The gel in it is said to contain stem cells, which is a separate topic I have covered elsewhere.
My honest assessment
The research on Hydrafil is genuine and interesting, but I would be cautious for three reasons.
First, disc degeneration is extremely common in people with no back pain at all, across every age group. So we must be careful before assuming a degenerate disc is the cause of any individual’s pain.
Second, we cannot yet be confident the improvement came from the gel rather than coincidence. Chronic lower back pain associated with degenerative discs characteristically waxes and wanes, and improves of its own accord from time to time.
Third, and most importantly, this was not a trial. There was no comparison against a placebo. A properly controlled study with somewhere over 200 patients is now underway, and I would want to see those results before injecting this substance into any of my own patients.
The key takeaway
There is legitimate research here, and it may yet amount to something. But promising early results are not the same as proven treatment, and a series without a control group cannot tell us whether the gel was responsible for the improvement.
Above all, do be cautious in how you interpret healthcare claims on social media. One of the two stories in this video was real research with genuine caveats. The other was simply invented.
