Understanding Carpometacarpal Osteoarthritis
The base of the thumb where it meets the hand is called the carpometacarpal (CMC) joint. This joint allows the thumb to move freely in many directions. It also provides strength so the hand can grasp and grip.
A smooth tissue called cartilage lines and cushions the bones of the CMC joint. Using the thumb puts stress on the joint. Over time, this can lead to the breakdown of the cartilage in the joint. This is known as osteoarthritis. With this condition, bones of the joint may be exposed and rub together. They may become irritated and rough. This keeps the joint from moving smoothly and can lead to pain.
How to say it
What causes CMC joint osteoarthritis?
This type of osteoarthritis is mainly caused by years of using the hand and thumb. The condition may be more likely if you:
Regularly do things that put great stress on the thumb joint
Have had previous thumb injuries
Have weakened or loose structures in the thumb
Are a woman who is past menopause
Symptoms of CMC joint osteoarthritis
Symptoms commonly include:
Thumb pain. It may get worse with pinching or gripping.
Sounds of grinding or popping in the thumb joint
Base of the thumb is enlarged
Treatment for CMC joint osteoarthritis
Osteoarthritis is a long-term (chronic) condition. Treatment focuses on managing symptoms. It may include:
Taking prescription or over-the-counter pain medicines to help reduce pain and swelling
Using a brace to rest and support the thumb joint
Using hot or cold therapy to help relieve pain
Learning and practicing ways to reduce stress on the thumb joint
Using devices that help protect the joint. These include jar openers, pen grips, and spring-action scissors.
Following a plan of physical therapy and exercises. This will help improve the flexibility and strength of the hand and thumb.
Getting shots of medicine into the joint to help relieve symptoms for a time
If these treatments don’t do enough to relieve severe pain, you may need surgery. There are several different types of surgery. In general, the goal is to relieve pain and help you to be able to use the hand.
When to call your healthcare provider
Call your healthcare provider right away if you have any of these:
Fever of 100.4°F (38°C) or higher, or as directed
Symptoms that don’t get better, or get worse