Condition
Thumb base arthritis
Wear at the saddle joint at the base of the thumb (the carpometacarpal or CMC joint). Pain with pinching, opening jars, and turning keys is common.
Common triggers
- Years of pinch-heavy tasks
- Family history; more common with age
When to seek care
- Pain that limits self-care or work
- Visible deformity at the base of the thumb
- Grip weakness that doesn't recover with rest
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Patient education · Thumb base arthritis
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Related care
Splints often used
Practice libraries beside this condition
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Sources
- Arthritis of the thumb — American Society for Surgery of the Hand(accessed 2026-04-22)