Summary: Researchers now have a hydrogel that can be used instead of joint replacement, and it is three times sturdier than natural joint cartilage. Unlike joint replacement surgery, it can copy the cushioning of joint cartilage. Joint disorders are common, and osteoarthritis of large joints like the knee can be quite disabling. In these disorders, the joint loses cartilage. They are quite hard to treat, and many people end up needing joint replacement surgery.
Joint disorders are common and are among the leading causes of chronic pain and disability. Disorders of large weight-bearing joints like the knee are more common. They cause a lot of pain and limit how patients move. Though joint disorders are widespread, they are hard to treat. There has been little progress in finding an effective chronic pain treatment for them. Most patients use non-steroidal anti-inflammatory drugs and joint supplements to manage the pain. But these treatments often fail to stop the condition from getting worse.
Most joint disorders come from osteoarthritis. It is a wear-and-tear disease. The soft cartilage in the joint wears out. Tears in the cartilage let the bones touch each other directly. The bones rub together, and that causes pain and joint deformity. Many supplements claim to nourish joints and even grow cartilage. But none seem to have any significant benefit.
So, as the condition gets worse, managing it with medicines gets harder, and joint replacement is the only option left. But joint replacement has many downsides. It is a highly invasive procedure. Also, artificial joints are made of hard materials or metals and lack many traits of the natural joint. So artificial joints are stiff, and they harm the structures around them. Now, though, it looks like researchers have found a material that can replace joint cartilage. It absorbs shock and glides like natural cartilage, but it is much stronger.
Researchers at Sparta Biomedical have developed a gel that is three times stronger than natural cartilage. They already plan to start clinical trials with the gel in 2023. It is a non-toxic hydrogel, and researchers have already tested its strength a great deal. For example, in a lab study, the hydrogel showed less wear and tear when its pulling strength was tested over 100,000 cycles.
So researchers propose that hydrogel implants may help ease joint pain and might be a better option than joint replacement surgery. These implants might also be used in the early stages of osteoarthritis, before significant changes in the bones have happened. Implanting hydrogel early will prevent further joint deformity.
Of course, implanting the gel has some challenges. For example, it may not hold well and may slip. Luckily, researchers have found a fix. They can attach the gel to a titanium plate that can be screwed in. These titanium plates can stay in place even better than natural joint cartilage.
Researchers have already done many in vivo (live animal) studies showing this kind of gel can be better than joint replacement. It also wears less and holds well when cemented with a titanium plate. Artificial joints are made of metals or polymers (plastics). This hydrogel is different. It can copy the smooth, cushiony nature of real cartilage, so joints move much better. The material is also quite safe for use in humans and does not cause allergic reactions or inflammation.
Doctors say this gel can have many other uses. For example, in back pain, loss of joint cartilage is to blame in most cases. Researchers are now developing an injectable gel that may help fill cracks and tears in damaged discs. So it could be a minimally invasive way to restore disc integrity.
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Frequently asked questions
What is the newest treatment for knee cartilage loss?
One of the most promising is a hydrogel implant developed by researchers at Sparta Biomedical. The gel is three times stronger than natural cartilage. Yet it keeps cartilage’s cushioning and gliding feel. It is fixed to a titanium plate that screws into place so it does not slip. The idea is to use it in early osteoarthritis, before the bone itself has changed shape.
Is a hydrogel implant better than knee replacement surgery?
That is the goal. Joint replacement is highly invasive. Metal or hard-plastic joints are stiff and can damage the structures around them. The hydrogel copies the smooth, cushiony nature of real cartilage. It showed a low level of wear across 100,000 test cycles in the lab. And it has not caused allergic reactions or inflammation. Used early, before the bone changes shape, it is meant to prevent further joint deformity.
When will artificial cartilage be available?
Not yet as a routine treatment. The hydrogel has passed a lot of lab strength testing and in vivo studies. Researchers planned to begin human clinical trials in 2023. Until trials show how it works in people, it stays in the research pipeline.
Can supplements or anti-inflammatory drugs rebuild knee cartilage?
No. Many supplements claim to nourish joints or regrow cartilage, but none has shown a meaningful benefit. Anti-inflammatory drugs and supplements can take the edge off the pain. But they do not stop osteoarthritis from getting worse. As the cartilage keeps wearing, bone rubs on bone, and pain and deformity grow. Then medicine alone becomes harder to rely on.
Could a gel help with back pain from damaged discs?
Researchers think so. Alongside the joint implant, they are developing an injectable gel. It is designed to fill cracks and tears in damaged spinal discs. If it works, it would offer a minimally invasive way to restore a disc’s integrity. Like the knee implant, it is still being developed and is not yet a standard treatment.
Medical Disclaimer: Keep in mind that the content provided is not direct medical advice for patient care, but is provided for thoughtful discussion.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
