Thumb pain can be a tough challenge affecting daily tasks. Let’s talk about an interesting study that looks at a potential treatment option for trapeziometacarpal osteoarthritis, known as rhizarthrosis. This condition causes mechanical pain and stiffness at the base of your thumb where it meets your wrist.
A research team studied a therapy called low-dose external beam radiotherapy (LD-EBRT). This means using a small amount of radiation to help reduce pain and improve function. Here’s what they found:
- Most people saw pain relief after treatment, with many feeling better after 3 and 12 months.
- Some people said their thumb function improved, making daily activities easier.
- The researchers found evidence to guide future studies about this treatment.
Want to know more about how this works? Let’s dive into the details!
In this article
- What is rhizarthrosis?
- What is LD-EBRT?
- What did the study find?
- Frequently Asked Questions
- Conclusion and next steps
- Disclaimer
- Study citation
What is rhizarthrosis?
Rhizarthrosis is a type of osteoarthritis that affects the trapeziometacarpal joint. This joint is located at the base of your thumb, near your wrist. When this joint wears down over time, it can lead to pain, stiffness, and difficulty using your thumb.
You may struggle to grab things, twist jars, or even write. Pain varies from mild discomfort to significant pain and may affect your quality of life.
What is LD-EBRT?
Low-dose external beam radiotherapy (LD-EBRT) uses small doses of targeted radiation. Radiation is energy that can treat swollen tissues and reduce inflammation—and this can be helpful for certain kinds of joint pain.
In this study, patients underwent six sessions where the joint was exposed to 0.5 Gy of radiation per session. By the way, Gy is shorthand for “gray,” a unit to measure radiation dose. Here, the dose is very low compared to what’s used in cancer treatment.
What did the study find?
Pain relief from LD-EBRT
The study found that after three months, most people said their pain had lessened. After 12 months, 57% of participants stated their pain got better overall, and 18% said their pain was completely gone.
Researchers used simple tools to measure pain, like a visual analogue scale (VAS). This scale asks you to rate pain on a scale of 0 (no pain) to 10 (worst imaginable pain). Participants rated their overall pain at a median of seven before the treatment. After three months, the score decreased to three, and by twelve months, it dropped even further to two. That’s a big improvement!
Did thumb function improve?
Thumb function is important—it lets you grip things, write, and perform everyday tasks. This study used a tool called the Patient-Rated Wrist Evaluation (PRWE) to measure thumb function. PRWE combines questions on pain and function. Lower scores mean better function.
Here is how the scores changed:
| Time Point | PRWE Score (Lower is Better) |
|---|---|
| Before Treatment | 0.5 |
| 3 Months | 0.36 |
| 12 Months | 0.27 |
Some movement improved too! Thumb flexion, or the ability to bend the thumb, increased from 64 degrees before treatment to 73 degrees after 12 months.
Where does the research go from here?
You may be wondering why this matters. This small group points to a promising future for LD-EBRT as a treatment. But to really prove its benefits, researchers say that many more patients—around 750—would need to be studied in a bigger trial. The study also recommends using the PRWE score in future studies because it is helpful for tracking progress.
Frequently Asked Questions
- What causes rhizarthrosis? It happens when the cartilage in the thumb joint wears out, leading to pain and stiffness.
- Is LD-EBRT painful? No, the radiation dose is so small it’s not felt during treatment.
- How long does relief last? In this study, some patients felt better up to 12 months after treatment.
- Would everyone benefit? Results may vary, and larger studies are needed to confirm the findings.
Conclusion and next steps
This study gives hope to people dealing with rhizarthrosis. LD-EBRT may provide relief that lasts, but we need more research to say for sure. If this sounds interesting to you, talk to your doctor about what treatment options might fit your needs.
Our website makes complex medical research about thumb pain and rhizarthrosis easy to understand. We only use published scientific studies, so you can trust the information. Explore our content and learn how science can help you.
Disclaimer
This article is for educational purposes only. It is not medical advice. Please consult your doctor about any questions or treatments for your thumb pain.
Study citation
Hermann, R. M.; Trillmann, A.; Becker, J. N.; Kaltenborn, A.; Nitsche, M.; Ruettermann, M., 2021. https://www.ncbi.nlm.nih.gov/pubmed/34842775
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