If you have thumb pain that gets worse when you use your hand, you might be dealing with an unstable thumb joint. This can happen after an injury or if your joints are naturally loose. Many people never get the right diagnosis. Without treatment, this instability can lead to early arthritis in your thumb joint.
A recent study looked at a special surgery that can help fix this problem. The researchers followed 53 patients for three years after surgery. The results show real hope for people with thumb pain.
Key Findings at a Glance
- Research shows that surgery reduced resting pain from 5.6 to 1.1 on a 10 point scale after three years
- Pain during activities dropped from 8.3 to 2.4 after surgery
- 74% of patients reported no difficulties at all three years after surgery
- The surgery used a technique that stabilizes the thumb joint to prevent future arthritis
- Patients averaged 26.8 years old, showing this problem affects young people
In this article:
- What is CMC instability of the thumb?
- Who gets thumb instability?
- How does the surgery work?
- What did the study results show?
- Frequently Asked Questions
- What This Means for You
- Important Information
- Scientific Source
What Is CMC Instability of the Thumb?
Your thumb has a special joint at the base where your hand meets your wrist. This is called the carpometacarpal joint. Doctors often call it the CMC joint for short.
Sometimes this joint becomes unstable. That means it moves too much or in ways it should not. Think of it like a door with loose hinges. The door still works but it wobbles and may eventually break down faster.
When the CMC joint is unstable, it can cause pain. Over time, this extra movement wears down the joint. This wearing down is called rhizarthrosis. That is just a special medical word for arthritis at the base of your thumb.
Here is where it gets interesting. Many people with thumb instability never get diagnosed. They just live with the pain. But without treatment, that unstable joint keeps wearing down. This can lead to severe arthritis, especially in younger people.
Who Gets Thumb Instability?
According to this study, thumb instability happens in two main groups of people.
The first group includes people who injured their thumb. This might happen in a fall, a sports accident, or any event that damages the ligaments. Ligaments are the tough bands that hold your joints together.
The second group is larger. These are people born with loose joints. Doctors call this hypermobility or hyperlaxity. If you can bend your joints more than most people, you might have this trait. It affects many joints in your body, not just your thumb.
You may be wondering why this matters. When your joints are naturally loose, they do not hold the bones together as firmly. This extra movement over the years can wear down the joint surfaces. The thumb CMC joint works very hard every day. It experiences a lot of force when you grip, pinch, or lift things.
Research shows that out of 53 patients in this study, 43 had instability because of loose joints. Only 10 had instability from an injury. The average age was just 26.8 years old. The youngest patient was only 15 years old. This tells us that thumb instability is a problem for young people, not just older adults.
How Does the Surgery Work?
The doctors in this study used a method called the Eaton Littler technique. This surgery has been around since 1973. The goal is simple. The surgeon uses your own tissue to create a new support for the unstable joint.
Let us look closer at what happens during the surgery. The doctor makes a small opening on the front and outer side of your thumb near the wrist. They use a piece of tendon to rebuild the ligament that is not working properly. A tendon is the strong cord that connects muscle to bone.
After the surgery, you wear a plaster splint for six weeks. This keeps your thumb still while it heals. After six weeks, you start gentle therapy. This includes treatments like magnetotherapy, which uses magnetic fields to reduce swelling, and warm up exercises to restore movement.
The surgery does not cure everything. But it does stabilize the joint. A stable joint moves less in the wrong ways. This reduces pain right away. Over time, it may also slow down the development of arthritis.
What Did the Study Results Show?
The researchers measured pain and daily function before surgery and then at several points after surgery. They followed patients for three years. Here is what they found.
Pain Levels Changed Dramatically
The doctors used something called the VAS scale. This is just a way to rate pain from 0 to 10. Zero means no pain. Ten means the worst pain you can imagine.
Before surgery, patients rated their pain at rest as 5.6 out of 10. That is more than half the scale. During activities, their pain was even worse at 8.3 out of 10.
According to this study, pain levels dropped quickly after surgery. At six months, resting pain fell to 2.9. By one year, it was down to 1.2. At three years after surgery, resting pain stayed low at 1.1.
Pain during activities also improved. At six months it dropped to 4.1. By three years, it settled at 2.4. That is still some pain, but much less than the 8.3 before surgery.
| Time Point | Pain at Rest | Pain During Activity |
|---|---|---|
| Before Surgery | 5.6 | 8.3 |
| 6 Months After | 2.9 | 4.1 |
| 12 Months After | 1.2 | 2.0 |
| 36 Months After | 1.1 | 2.4 |
Daily Activities Became Easier
The study also used something called the DASH score. This measures how well you can do everyday tasks with your hands. A higher score means more difficulty. A lower score means you can do more without problems.
Before surgery, the average DASH score was 81.2. That is very high. It means patients had serious trouble doing normal activities.
Six months after surgery, the score dropped to 46.3. By one year, it fell to 15.2. At three years, it was 18.4. That is a huge improvement.
Most People Felt Much Better
The researchers asked patients how they felt three years after surgery. They gave them three choices. No difficulties, some difficulties that did not limit normal life, or difficulties that did limit normal activities.
Here is what patients said. Out of 53 people, 39 patients, or 74%, said they had no difficulties at all. Ten patients, or 19%, had some minor difficulties but could still do everything they needed. Only four patients, or 7%, still had problems that limited their daily life.
About This Site
We know that reading medical research can feel overwhelming. That is why this site exists. We take published scientific studies about thumb pain and rhizarthrosis and explain them in simple language. Every article you read here is based only on real research from medical journals. We do not make up facts or give personal opinions. Our goal is to help you understand what science says about your condition. Feel free to explore more articles to learn about treatments, causes, and ways to manage thumb arthritis.
Frequently Asked Questions
Can thumb instability really cause arthritis?
Yes. According to this study, when the thumb CMC joint is unstable, it moves too much. This extra movement wears down the cartilage inside the joint. Over time, that wearing down becomes arthritis. The study explains that untreated instability is the basis for developing rhizarthrosis in young people.
How long does recovery take after this surgery?
Research shows that you wear a splint for six weeks after surgery. After that, you begin gentle therapy. Pain improves quickly. Most patients saw major improvements by one year. The study followed people for three years, and results stayed good during that time.
Is this surgery only for people who got injured?
No. This study included 43 patients with loose joints and only 10 with injuries. The surgery worked well for both groups. If you have naturally loose joints and thumb pain, this type of surgery may help you too.
Will the surgery cure my thumb problem forever?
The study is honest about this. The surgery stabilizes the joint and reduces pain. It may delay arthritis. But the researchers say this is a short term follow up. They cannot promise it prevents arthritis forever. What it does do is reduce pain and improve function, especially in younger people. That can give you years of better quality of life.
What This Means for You
If you have pain at the base of your thumb, especially if your joints are loose or you had an injury, talk to your doctor. Thumb instability is more common than many people realize. It often goes undiagnosed.
This study shows that surgery can make a real difference. Pain dropped dramatically. Daily tasks became easier. Most people felt much better three years later. The surgery uses your own tissue to stabilize the joint. It does not replace the joint or use artificial parts.
You do not have to live with constant thumb pain. Getting the right diagnosis and treatment may help you avoid severe arthritis later. This is especially important if you are young. Treating instability now can protect your thumb for many years to come.
Important Information
This article is for educational purposes only. It is not medical advice. It does not replace a consultation with your doctor. If you have thumb pain or think you might have joint instability, please see a qualified healthcare provider. Only a doctor can diagnose your condition and recommend the right treatment for you.
Scientific Source
Pilny, J., Kachlik, D., Zeman, P., Horackova, K., & Hajek, P. (2023). Instabilities of the Thumb Carpometacarpal Joint: Our Surgical Outcomes. Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca.