Thumb arthritis, sometimes called basal joint arthritis, is a common cause of pain at the base of the thumb. All joints are lined by smooth cartilage, and when this cartilage wears thin, normal motion of the joint can become painful. Cartilage can wear out more quickly due to genetics, over-use, or prior injuries.
Patients with basal joint arthritis experience pain at the base of the thumb that tends to be worse during activities, such as when pinching objects, opening jars, turning doorknobs, or writing.
Thumb arthritis can be diagnosed by talking with your doctor and having them examine your hand. X-rays can be useful to see the severity of the cartilage loss, and oftentimes will show development of bone spurs (osteophytes) - see figure above.
- Splinting of the base of the thumb during activities
- Ice, or heat (such as paraffin baths)
- Anti-inflammatories (such as ibuprofen or naproxen – if medically safe)
- Steroid injection into the arthritic joint
- Therapy to strengthen the muscles around the thumb (see 3 videos below, courtesy of Stanford University Hand Therapy Rehabilitation)
- Many surgical treatment options are available for thumb arthritis. My preference is to remove the trapezium and its bone spurs, and support the thumb on a bed of local tendon (like a hammock) to cushion the bone.
- A splint is worn for 4 weeks to allow healing, then motion and use of the thumb is resumed (see image on right)
- Therapy is often used after surgery to achieve optimal motion and strength