If you have arthritis at the base of your thumb, you may have heard about surgery options. One idea uses a tiny scaffold that dissolves over time. This scaffold sits between your bones to keep them from rubbing together.
Researchers looked at patients who had this surgery and followed them for many years to see if the good results lasted.
Here are three things you should know:
- The scaffold is made from a material called poly-ld-lactic acid that the body absorbs slowly.
- Patients had less pain, better grip strength, and better thumb movement after surgery.
- These good results stayed strong even years after the operation.
Key Findings at a Glance
- Patients experienced improved grip strength after surgery that lasted over the years
- Range of motion in the thumb improved and remained better long term
- Pain levels decreased and stayed low over time
- X-rays showed the first metacarpal bone gradually sinking down, but this did not affect how patients felt or used their hands
- The scaffold offers a good alternative to surgeries that use tendon from other parts of your body
In This Article
What Is Rhizarthrosis and Why Does It Hurt?
What is Rhizarthrosis? Rhizarthrosis is arthritis at the base of your thumb. It happens where your thumb bone connects to your wrist. The smooth cushion between these bones wears away, so the bones rub together. This causes pain, swelling, and makes it hard to grip or pinch things.
The joint at the base of your thumb is called the CMC joint (carpometacarpal joint). It moves your thumb in many directions.
You may be wondering why this matters. When this joint gets very painful and other treatments do not help, surgery becomes an option. Doctors have tried many different ways to fix this problem over the years.
What Type of Surgery Did Researchers Study?
According to this study, doctors tested a surgery that uses a special scaffold. Think of a scaffold like a tiny sponge or spacer between your bones. This scaffold is made from poly-ld-lactic acid.
This material slowly dissolves inside your body over time. Your body absorbs it bit by bit. The idea is that the scaffold holds the space open long enough for your body to build up scar tissue in that spot. This scar tissue then keeps the bones from grinding together.
What is a bioabsorbable scaffold?
A bioabsorbable scaffold is a small device that doctors place inside your body during surgery. It is made from materials that your body can slowly break down and absorb. You do not need another surgery to remove it. It disappears on its own over time.
The surgery studied is called interposition arthroplasty. Interposition means placing something between two things. Arthroplasty means repairing or rebuilding a joint. So this surgery puts the scaffold between the bones at your thumb joint.
This approach is different from older surgeries. In the past, doctors often removed a small bone and used a piece of tendon from another part of your body to fill the space. That works, but it means taking healthy tissue from another spot.
What Did the Study Find?
The study shows three big improvements: stronger thumb, bigger movement, and less pain.
The study explains what each means. Strength is how hard you can grip or pinch with your thumb. Range of motion is how far you can move your thumb in different directions. Pain is how much your thumb hurts during daily activities.
These improvements did not go away quickly. They lasted for years. Doctors followed patients over time and they still reported good results.
What do good results look like?
Good results mean being able to do daily tasks with less trouble. This includes picking up small objects, opening jars, writing or using tools without pain, and doing activities you enjoy. In this study these abilities stayed better over the years. This suggests this surgery gives lasting help.
Why Do X-rays Show Something Different Than How Patients Feel?
Here is something surprising. Years after surgery, X-rays often show the first metacarpal bone sinking down. The metacarpal is the long bone in the thumb that connects to your hand.
What does collapse mean?
In this case, collapse means the bone slowly sank down into the space where the small wrist bone used to be. Imagine stacking blocks. If you remove one block, the block on top settles down into that empty space. Something similar happens here.
You may be wondering why doctors were not worried about this. The answer is simple. Patients felt fine. Their thumbs worked well. They had less pain. They could use their hands for daily tasks.
This tells us something important. What shows up on an X-ray does not always match how a person feels or functions. X-rays show the bones. But your experience includes muscles, tendons, nerves, and how everything works together.
The researchers concluded that even though the bones shifted on X-rays, the surgery still helped patients in real life. The scaffold did its job. It gave the body time to heal and adjust. By the time it dissolved, the thumb had found a new stable position.
Why This Finding Matters
In the past, doctors might have looked at those X-rays and thought the surgery failed. But this study shows us to focus on how patients actually feel and function. That is the true measure of success.
According to this study, the poly-ld-lactic acid scaffold is a good alternative to traditional surgery methods. It avoids the need to harvest tendon from another part of your body. And it gives long lasting results that make life better for people with thumb arthritis.
About This Site
This website helps people understand thumb pain and rhizarthrosis by translating medical research into plain language. We only use information from real published scientific articles. Our goal is to give you clear, accurate facts so you can have better conversations with your doctor. Feel free to explore more articles on treatments, causes, and ways to manage your symptoms.
Common Questions
What is poly-ld-lactic acid?
Poly-ld-lactic acid is a type of material that doctors can safely put inside the human body. It is similar to dissolvable stitches. Over time, your body breaks it down and absorbs it. You do not need surgery to remove it. It is used in many medical devices because it is safe and effective.
Does the scaffold stay in my thumb forever?
No. The scaffold dissolves slowly over time. Your body absorbs it bit by bit. Eventually, it is completely gone. By that time, your body has built up scar tissue and healed around the space. The scaffold is only there temporarily to help your thumb heal.
Will my thumb bone collapsing cause problems later?
According to this study, most patients had bone collapse on X-rays but still felt good and used their thumbs well. The collapse did not stop them from having less pain, better strength, or better movement. Doctors believe this is a normal part of how the thumb adjusts and heals after this surgery.
How is this surgery different from other thumb arthritis surgeries?
Traditional surgery often removes a small wrist bone and uses a piece of tendon from another part of your body to fill the space and suspend the thumb bone. This new method uses a dissolving scaffold instead. That means doctors do not need to take tendon from somewhere else. Both surgeries aim to reduce pain and improve thumb function.
What This Means for You
If you have painful thumb arthritis that does not get better with other treatments, surgery is one option. This study shows that using a bioabsorbable scaffold can give you less pain, better strength, and better movement in your thumb.
These good results last for years. Even though X-rays may show some bone changes, most patients feel satisfied with how their thumbs work in daily life.
Talk with your doctor about which surgery option is best for your situation. Every person is different. Your doctor can help you understand the benefits and risks of each approach.
You deserve to have less pain and to use your hands comfortably again. Learning about your options is a great first step.
Is this medical advice?
This article is for educational purposes only. It is not medical advice. It does not replace a consultation with a qualified healthcare provider. Always talk to your doctor about your specific symptoms and treatment options. Only a doctor who examines you can recommend the right treatment for your individual situation.
Research Source
Study by: Marcuzzi, A.; Colzani, G.; Acciaro, A. L.; Rosa, N. D.; Landi, A. (2022)
Published in: Hand (N Y)