Thumb pain can feel strange and worrisome, especially if tasks you do every day seem to make it worse. Today, we’re diving into a research study that looks at whether jobs involving the processing of banknotes, like sorting or counting them, could be linked to thumb osteoarthritis, also called rhizarthrosis. This study might answer some of your questions about what could be causing your pain.
Key points:
- Rhizarthrosis is arthritis at the base of the thumb, where the thumb meets the hand.
- This study followed workers at Belgium’s National Bank to see if their tasks increased their chances of developing rhizarthrosis.
- The research found general manual labor with banknotes could be a factor but highlighted that specific tasks like ‘manual counting’ may not make the risk higher.
In this article:
- What is rhizarthrosis?
- Did the study find a link between work and thumb pain?
- Why didn’t “manual counting” increase the risk?
What is rhizarthrosis?
Sometimes if we use our thumbs a lot they ache and feel stiff. Rhizarthrosis is arthritis at the base of the thumb. Arthritis happens when the cushioning between bones wears down over time, causing pain, swelling, and stiffness.
It is common in people over 60, affecting up to 30% of them, especially women. But researchers still debate if certain jobs that put stress on the thumbs could make rhizarthrosis worse or happen sooner.
Did the study find a link between work and thumb pain?
This study followed 195 employees from the National Bank of Belgium who processed banknotes, either manually or with machines. Researchers collected detailed work histories, how long each person had certain job titles, and then checked every thumb with clinical exams and X-rays.
Here are their findings:
- Nearly 27% of women and 17% of men had rhizarthrosis, with average ages of 52–53 years.
- The study confirmed that older workers and women were more likely to have rhizarthrosis.
- Workers exposed to banknote processing tasks for 10 years or more had a significantly higher risk of developing rhizarthrosis. Their odds increased by 53%.
| Group | Rhizarthrosis Prevalence | Average Age |
|---|---|---|
| Women | 27% | 52.3 years |
| Men | 17% | 53.2 years |
Why didn’t “manual counting” increase the risk?
You may wonder why handling banknotes caused thumb problems overall, but the task called “manual counting” did not show a higher risk. You might think counting lots of banknotes by hand would wear down your thumbs faster. Here is where it gets interesting.
In this study, workers described “manual counting” as very tough on the thumbs due to the repetitive motion. Despite this, researchers didn’t find that people doing this specific task were more likely to have rhizarthrosis than other workers. The study didn’t explain why this happened. But it’s worth noting that jobs involving repetitive stress don’t always affect everyone the same way. Other factors, like age or gender, might still play a bigger role in thumb health.
What does this mean for you?
If you have thumb pain and think your work could be the cause, this study shows that long years of exposure to tasks like handling objects by hand can raise your risk of rhizarthrosis. But one specific task is not always the trigger. Pay attention to how your hands feel and ask a doctor or therapist for advice early.
FAQ
- What causes rhizarthrosis?
Rhizarthrosis happens when cartilage, which acts like a cushion between thumb bones, wears down due to age, usage, or sometimes repetitive stress. - Does manual work always cause thumb arthritis?
No, but tasks that stress the thumb over many years may increase your risk, especially if you’re older or female. - Can I fix rhizarthrosis?
While there isn’t a cure, treatments like rest, braces, physical therapy, or, in severe cases, surgery can help manage symptoms. - What are the first signs?
You might notice thumb pain or stiffness, especially at the base where the thumb meets the wrist. It may also hurt to pinch or grip small objects.
Conclusion
If thumb pain or stiffness makes daily tasks hard, you are not alone. The study shows that some jobs can add stress to our thumbs, especially after many years. Age and being female also help determine thumb health. If you think work causes thumb problems, talk with your doctor or therapist about ways to protect your joints.
This site tries to make science easy to understand. We explain medical research so you can take good care of your hands. You can read more articles to learn about rhizarthrosis causes, treatments, and solutions.
Disclaimer
This content is for educational purposes only and is not medical advice. For symptoms or concerns, always consult a medical professional.
Study Citation
Verrijdt, G.; De Landtsheer, A.; Mellen, A.; Godderis, L., 2017. Link to study