Question 1

What is thumb CMC arthritis?

Accepted Answer

Thumb CMC (carpometacarpal) arthritis is arthritis at the base of your thumb where the thumb meets the wrist. This joint, called the CMC joint, is unique because it allows your thumb to move in many directions for pinching and gripping. The cartilage in this joint wears away, causing bone-on-bone contact, pain, and weakness. It's the second most common place for hand arthritis (after finger joints) and is particularly common in women over 40.

Question 2

Why is thumb arthritis so much more common in women?

Accepted Answer

Thumb CMC arthritis is 10-15 times more common in women than men. The reasons aren't fully understood but likely include hormonal factors, differences in joint anatomy, and possibly greater ligament laxity (looseness) in women allowing more abnormal joint movement over time. It typically develops after menopause. The exact mechanisms are still being researched.

Question 3

Can thumb arthritis be cured without surgery?

Accepted Answer

Arthritis can't be reversed, but many people manage thumb CMC arthritis successfully without surgery. Splinting, activity modification, adaptive equipment, and occasional cortisone injections control symptoms well for many people. About 40-50% of people with thumb CMC arthritis never need surgery. Surgery is only considered when non-surgical treatments have failed and pain significantly affects your quality of life and hand function.

Question 4

How long does a cortisone injection help?

Accepted Answer

Cortisone injections for thumb CMC arthritis typically provide relief for 3-6 months. About 60-70% of people get significant pain relief from an injection. However, the effect is temporary and symptoms usually return. Repeat injections can be given (usually limited to 3-4 per year) but often become less effective over time. Injections work better for mild-moderate arthritis than severe disease.

Question 5

What is a trapeziectomy and LRTI?

Accepted Answer

Trapeziectomy means removing the trapezium - the small bone at the base of your thumb that has become arthritic. LRTI stands for Ligament Reconstruction and Tendon Interposition. This is the most common surgical technique, where the trapezium is removed, then a tendon from your forearm is used to reconstruct the ligament and stabilize your thumb. It's been performed for decades with excellent long-term results - 85-90% of people are very satisfied with pain relief and function.

Medical Disclaimer

Thumb Arthritis (Base of Thumb)

📖What is Thumb Arthritis (Base of Thumb)?

🔬What Causes It?

⚠️Risk Factors

You may be at higher risk if:

🛡️Prevention