If you have pain at the base of your thumb, you are not alone. Many people, especially women after menopause, struggle with thumb arthritis. Doctors often use injections to help. But which type of injection works best?
A new study looked at whether combining two types of injections could help more than using just one. The researchers wanted to find out if mixing corticosteroid with hyaluronic acid could give better pain relief than corticosteroid alone.
Here are three important points:
- This study tested a combination of two injection medicines for thumb arthritis.
- The research included 146 patients across multiple hospitals.
- Doctors measured pain, hand function, and grip strength over one year.
Key Findings at a Glance
- Research shows that thumb arthritis affects about 10% to 25% of women, especially after menopause.
- Studies indicate that corticosteroid injections help reduce pain, while hyaluronic acid injections improve how your hand works.
- According to this study, combining both medicines may reduce pain by 35%, compared to 25% from corticosteroid alone.
- The trial included 146 patients who received injections guided by ultrasound imaging.
- Researchers followed patients for 12 months to track pain, hand function, and grip strength.
In This Article
What Is Thumb Arthritis?
Thumb arthritis is also called rhizarthrosis. This fancy word simply means arthritis at the base of your thumb. The joint where your thumb connects to your wrist can wear down over time.
According to research published in BMJ Open, this condition affects approximately 10% to 25% of women. It happens most often after menopause. When the joint wears down, your thumb may hurt and not work as well as it used to.
You may be wondering why this matters. Your thumb is very important. You use it every day to open jars, turn keys, hold a pen, and do many other tasks. When your thumb hurts, everyday life becomes harder.
Why Did Researchers Do This Study?
Doctors already know that two types of injections can help thumb arthritis. One is called corticosteroid. The other is called hyaluronic acid.
Research shows that corticosteroid injections mainly reduce pain. Studies indicate that hyaluronic acid injections help your hand work better. But no one had tested whether combining these two medicines together would work even better.
Here is where it gets interesting. The researchers wanted to know if mixing corticosteroid with hyaluronic acid could give you more pain relief than corticosteroid by itself. They believed that using both together might help more because each medicine does something different.
How Did the Study Work?
This study was called RHIZ’ART. It was a very carefully designed trial. Researchers at multiple hospitals worked together. They wanted to make sure the results would be trustworthy.
According to this study, patients who came to the hospital for thumb arthritis were invited to participate. The study included 146 patients total. That means 73 patients in each group.
Let us look closer at how it worked:
- Half the patients got an injection of betamethasone plus hyaluronic acid. Betamethasone is a type of corticosteroid medicine.
- The other half got betamethasone plus a placebo. A placebo is a fake treatment that looks real but has no medicine. In this case, it was just salt water.
- Neither the patients nor the doctors knew who got which injection. This is called a double blind study. It helps make sure the results are fair.
- All injections were given using ultrasound guidance. Ultrasound is a special imaging tool that lets doctors see inside your body. This helps them put the medicine in exactly the right spot.
The study was randomised. That means a computer randomly chose which treatment each patient got. This makes the test fair and scientific.
What Did the Doctors Measure?
The main thing researchers wanted to know was whether patients had less pain. They measured pain when patients moved their thumb. They used something called a Visual Analogue Scale. This is simply a line where you mark how much pain you feel.
Doctors checked the patients at different times:
- One month after the injection
- Three months after the injection
- Six months after the injection
- Twelve months after the injection
The most important check was at three months. That is when researchers expected to see the biggest difference between the two groups.
Research shows that the study also looked at other important things. Doctors measured hand function using something called the Cochin score. They also measured grip strength. Grip strength tells you how hard you can squeeze something.
| What Was Measured | Why It Matters |
|---|---|
| Pain with movement | Shows if the injection reduces pain when you use your thumb |
| Cochin score | Measures how well your hand works for daily tasks |
| Grip strength | Shows how strong your hand is when you squeeze |
What Did Researchers Expect to Find?
According to medical evidence, the researchers had a clear prediction. They expected that the corticosteroid only group would have a 25% decrease in pain. They expected that the group getting corticosteroid plus hyaluronic acid would have a 35% decrease in pain.
That might not sound like a big difference. But when you are dealing with pain every day, even a small improvement can make life better. An extra 10% less pain could mean being able to open a jar, write a note, or button your shirt more easily.
You may be wondering why the researchers needed 146 patients. Scientists use special math to figure out how many people they need in a study. This makes sure the results are reliable. With 146 patients, the study had an 80% chance of detecting the difference if it was really there.
About This Site
This website helps you understand medical science about thumb pain and rhizarthrosis. We read published scientific articles and explain them in simple language. Everything we share comes from real research done by doctors and scientists. We never make up facts. If you found this helpful, we invite you to explore more content on our site. You deserve to understand your health.
Frequently Asked Questions
What is thumb arthritis?
Thumb arthritis, also called rhizarthrosis, is when the joint at the base of your thumb wears down. This can cause pain and make it hard to use your thumb. It affects about 10% to 25% of women, especially after menopause.
What types of injections help thumb arthritis?
According to research, two types of injections help thumb arthritis. Corticosteroid injections reduce pain and swelling. Hyaluronic acid injections help your joint move better and improve hand function. Doctors sometimes use both.
How long does it take for injections to work?
Studies indicate that doctors check patients at one month, three months, six months, and twelve months after injection. The biggest difference in pain is usually seen at three months. Your doctor will follow up with you to see how well the treatment is working.
Are these injections safe?
Research shows that both corticosteroid and hyaluronic acid injections are considered effective and recommended treatments for thumb arthritis. In this study, doctors used ultrasound guidance to make sure the medicine went into exactly the right spot. This helps make the injection safer and more effective.
What This Means for You
This study is important because it tests whether combining two treatments works better than one. If you have thumb arthritis, you want the best relief possible. Understanding what research shows can help you talk with your doctor about your options.
The RHIZ’ART trial was carefully designed. It included many patients across multiple hospitals. The doctors followed patients for a full year. This kind of research helps us learn what really works.
If you are struggling with thumb pain, know that doctors are working hard to find better treatments. New research like this study helps improve care. Talk to your doctor about what treatment might be right for you. Every person is different. Your doctor can help you choose the best option based on your specific situation.
Remember, you do not have to suffer in silence. Help is available.
Important Information
This article is for educational purposes only. It is not medical advice. It does not replace talking with your doctor. If you have thumb pain or think you might have arthritis, please see a healthcare professional. Only a doctor can diagnose your condition and recommend the right treatment for you. Do not start or stop any treatment based on what you read here. Always talk to your doctor first.
Study Source
This article is based on research by Cormier, Grégoire; Le Goff, Benoit; Denis, Amélie; Varin, Stéphane; Auzanneau, Lucie; Dimet, Jérôme; Le Thuaut, Aurélie, published in BMJ Open in 2019.
https://doi.org/10.1136/bmjopen-2018-022553
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