Quick Answer
Thumb-base osteoarthritis affects the carpometacarpal (CMC) joint at the base of the thumb and can make gripping, pinching and opening jars painful. X-ray severity does not always match symptom severity. Management usually starts with nonsurgical measures and progresses stepwise according to pain and functional impact.
Symptoms
- Pain and tenderness at the base of the thumb
- Pain with gripping, pinching, opening jars or turning keys
- Reduced grip or pinch strength
- In advanced disease, deformity or loss of motion
Diagnosis
Diagnosis begins with history and examination. X-rays can assess joint-space loss, osteophytes and alignment, but imaging should be interpreted together with symptoms because substantial radiographic arthritis can exist with little pain.
Stepwise Treatment
Nonsurgical Care
The NICE-accredited BSSH BEST guideline recommends starting with education, activity adaptation and a comprehensive self-management package. Hand therapy, exercises and splinting may be added. If symptoms remain troublesome, an intra-articular corticosteroid injection can be considered in selected patients.
When Is Surgery Considered?
Surgery may be discussed when pain and disability continue despite appropriate nonsurgical care. Trapeziectomy is a commonly used operation; current BSSH guidance does not show clear benefit from routinely adding more complex procedures to simple trapeziectomy. Joint replacement, fusion or other procedures may suit selected patients.
Recovery
The goal of nonsurgical care is to improve comfort and function. Recovery after surgery is gradual over weeks to months and depends on the procedure, rehabilitation and individual demands.
Frequently Asked Questions
Does arthritis on an X-ray automatically mean surgery?
No. Treatment is driven by symptoms and function, not the X-ray alone.
Which operation is best?
There is no single best procedure for every patient. Current guidance supports individualized decision-making.
Sources
- BSSH BEST — Evidence-based Management of Adults with Thumb Base Osteoarthritis (NICE-accredited)
- BSSH — Basal thumb arthritis patient information
Evidence sources checked: 7 August 2026.
This page is for general patient education and does not replace an individual medical examination or treatment plan.