Thumb Arthritis
Wear-and-tear arthritis at the base of the thumb
Quick Facts
- Type: Osteoarthritis (joint) condition
- Joint affected: Base of the thumb (CMC joint)
- Common in: Older adults, especially women
- Main symptom: Pain with pinching and gripping
Overview
Thumb arthritis affects the joint at the base of the thumb, where the thumb meets the wrist, known as the carpometacarpal (CMC) or basal joint. This joint allows the thumb to swivel, pivot, and pinch, making it one of the most-used joints in the hand. Over time, the smooth cartilage that cushions the joint can wear down, and the bones begin to rub together, causing arthritis.
It is one of the most common forms of osteoarthritis in the hand and becomes more frequent with age, particularly in women. Because the thumb is involved in so many daily activities, the condition can be quite limiting. Fortunately, many people manage well with non-surgical treatment, and effective surgery is available for those whose symptoms become severe.
Symptoms
Symptoms usually develop gradually and center on the base of the thumb.
- Pain at the base of the thumb with gripping, pinching, or twisting, such as turning a key or opening a jar
- Swelling, tenderness, and stiffness at the thumb base
- Reduced strength and difficulty with pinch tasks
- A decreased range of motion in the thumb
- In advanced cases, a bony bump at the joint and the thumb base appearing to jut out, with the thumb drawing inward
Pain is often worse with activity and may ease with rest, though over time it can become more constant.
Causes
Thumb arthritis usually results from wear of the joint cartilage over time, sometimes hastened by other factors.
- Age-related wear: The most common cause, as cartilage thins with use over the years.
- Previous injury: A past fracture, sprain, or dislocation of the thumb base can lead to arthritis later.
- Joint shape and laxity: Naturally loose ligaments or joint anatomy that places more stress on the joint.
- Repetitive strain: Activities and jobs involving heavy, repeated use of the thumb.
Risk Factors
- Older age
- Female sex
- Previous thumb or wrist injuries
- Activities or occupations with heavy, repetitive thumb use
- Loose ligaments or certain joint shapes
- A family history of osteoarthritis
Diagnosis
The diagnosis is based on the typical symptoms, an examination, and imaging.
- Physical examination: The doctor checks for tenderness and may apply gentle pressure and twist the thumb joint (a grind test) to reproduce the pain.
- X-rays: Show narrowing of the joint, bone spurs, and other changes that confirm arthritis and indicate its severity.
- Assessment of grip and pinch strength: To gauge how the condition affects function.
Treatment
Treatment usually starts with non-surgical measures and progresses to surgery only if symptoms remain severe.
- Splints and braces: A thumb or wrist splint supports the joint and reduces pain, especially during activity or at night.
- Activity changes and aids: Modifying tasks and using adapted tools or jar openers to reduce strain.
- Medications: Over-the-counter pain relievers and anti-inflammatory drugs to ease pain and swelling.
- Hand therapy: Exercises to maintain motion and strengthen surrounding muscles.
- Injections: Corticosteroid injections into the joint can relieve pain for a time.
- Surgery: For severe, persistent cases, procedures to reconstruct or replace the joint can restore comfort and function.
Many people manage well for years with conservative care, turning to surgery only when needed.
Prevention
Thumb arthritis cannot always be prevented, but some steps may reduce strain and slow its progress.
- Use proper technique and ergonomic tools for repetitive thumb tasks
- Take breaks and avoid prolonged, forceful pinching
- Treat thumb injuries properly to lower the chance of later arthritis
- Keep the hand muscles strong and flexible
When to See a Doctor
See a doctor if you have ongoing pain, swelling, or weakness at the base of your thumb that interferes with gripping, pinching, or daily tasks, or if pain persists despite rest and over-the-counter measures. Early evaluation can confirm the diagnosis, rule out other causes, and start treatment that protects function and delays the need for surgery.
Frequently Asked Questions
Where exactly does thumb arthritis cause pain?
It affects the joint at the base of the thumb, where the thumb meets the wrist (the basal or CMC joint). Pain is felt at the thumb base, especially with pinching, gripping, or twisting movements like turning a key or opening a jar.
Who is most likely to get thumb arthritis?
It becomes more common with age and is more frequent in women. Previous thumb injuries, loose ligaments, repetitive heavy thumb use, and a family history of osteoarthritis also increase the risk.
Can thumb arthritis be treated without surgery?
Yes. Many people improve with splints, activity changes, hand therapy, pain or anti-inflammatory medication, and corticosteroid injections. Surgery is generally reserved for severe, persistent cases that do not respond to these measures.
Will a splint help?
Often, yes. A supportive thumb or wrist splint rests the joint and can reduce pain during activities or at night. It is one of the common first treatments and can be combined with other measures.
When is surgery considered?
Surgery is considered when pain and loss of function remain severe despite non-surgical treatment. Procedures to reconstruct or replace the worn joint can relieve pain and restore the ability to pinch and grip.
References
- American Academy of Orthopaedic Surgeons (AAOS). Thumb Arthritis.
- Mayo Clinic. Thumb arthritis — Symptoms and causes.
- American Society for Surgery of the Hand.
- MedlinePlus, U.S. National Library of Medicine. Osteoarthritis.