If opening a jar, turning a key, or pinching something between your fingers has become painful, you may be living with base of thumb arthritis, also called basal joint arthritis or CMC (carpometacarpal) joint arthritis. It is one of the most common forms of hand arthritis, and it can significantly affect your daily quality of life.
At Academy Orthopedics, our board-certified hand and wrist specialists provide comprehensive, individualized care, from conservative management to advanced surgical solutions, so you can get back to doing what matters most. Schedule an appointment now.
What Is Base of Thumb Arthritis?
The carpometacarpal (CMC) joint is where the base of your thumb meets your wrist. This small but highly mobile joint allows your thumb to rotate, pinch, and grip, movements you rely on dozens of times each day. Inside the joint, smooth cartilage cushions the bones and allows frictionless movement.
Base of thumb arthritis, clinically known as trapeziometacarpal (TMC) arthritis or basal joint arthritis, occurs when the cartilage gradually breaks down. As the protective cushioning wears away, the bones begin to rub against each other, causing pain, swelling, stiffness, and weakness. Over time, the joint loses its normal shape and function.
This condition is one of the most frequently encountered forms of hand arthritis seen by orthopedic hand surgeons, and it becomes more common with age. The good news is that with proper diagnosis and the right treatment plan, most patients experience meaningful, lasting relief.
What Causes Thumb Arthritis?
Thumb basal joint arthritis is primarily a degenerative condition, but several factors can accelerate cartilage breakdown or increase your risk:
- Aging and natural cartilage wear: The most common cause, cartilage deteriorates over decades of use
- Previous thumb injuries or fractures: Prior trauma to the CMC joint can destabilize the joint and accelerate degeneration
- Repetitive pinching and gripping motions: Occupations or hobbies requiring repetitive hand use increase stress on the joint over time
- Genetics and family history: A predisposition to joint laxity or osteoarthritis/rheumatoid arthritis can run in families
- Hormonal changes: Post menopausal women are at significantly higher risk, likely due to changes in ligament laxity and cartilage metabolism
- Ligament laxity: Loose ligaments around the CMC joint can lead to abnormal movement patterns that wear cartilage unevenly
- Women over 40, particularly post menopausal women, are the most commonly affected group, though the condition can develop in men and younger adults who have experienced thumb injuries.
What Are The Symptoms of Base of Thumb Arthritis
Symptoms typically develop gradually and worsen over time. The most common symptoms and signs of CMC joint arthritis include:
- Pain and tenderness at the base of the thumb, especially with pinching or gripping
- Swelling and inflammation around the CMC joint
- Weakness when trying to grip objects, open jars, turn doorknobs, or use keys
- Aching or deep soreness after activity, often worse by end of day
- A bony prominence or visible bump at the base of the thumb
- Morning stiffness that gradually loosens with movement
- Decreased range of motion and difficulty with fine motor tasks
It is important to note that symptoms often progress through four defined stages (Stage I through Stage IV), known as the Eaton-Littler Classification. The appropriate treatment, and whether surgery is considered, depends significantly on which stage of arthritis you are experiencing. A proper evaluation by a hand specialist is the best way to determine your stage and understand your options.
How Is Basal Thumb Arthritis Diagnosed?
Diagnosing base of thumb arthritis begins with a thorough evaluation that takes into account your symptoms, medical history, activity level, and physical examination findings. At Academy Orthopedics, our hand and wrist specialists use a comprehensive, staged diagnostic process before recommending any course of treatment.
Your evaluation typically includes:
Physical examination, including the Grind Test: A clinical maneuver in which the physician gently compresses and rotates the thumb metacarpal against the trapezium. Pain and crepitus (grinding sensation) are strongly diagnostic of CMC arthritis
X-rays: Imaging reveals joint space narrowing, bone spur (osteophyte) formation, and changes in bone alignment
MRI or CT scan: Used in earlier stages or complex cases to evaluate cartilage integrity and soft tissue structures
Activity and functional assessment: Understanding how your symptoms affect daily tasks
Eaton Littler Staging (I–IV): Your orthopedic surgeon classifies your arthritis using this system to guide treatment
What Are the Non Surgical Treatment Options for Arthritis of the Thumb?
For many patients, particularly those with Stage I through Stage III arthritis, non-surgical treatments can effectively manage pain and preserve function.
Activity Modification
Reducing repetitive pinching, gripping, or wringing motions can reduce pain and inflammation.
Splinting / Orthotic Support
A thumb spica splint immobilizes and supports the CMC joint, allowing inflamed tissue to rest.
Anti-Inflammatory Medications (NSAIDs)
Taking anti-inflammatory medications can reduce pain and swelling in the short term.
Cortisone Injections
A corticosteroid injection into the CMC joint can provide significant pain relief for several months.
Hand Therapy / Occupational Therapy
Therapy focuses on strengthening supporting muscles, improving mechanics, and teaching joint protection strategies.
Platelet Rich Plasma (PRP) Injections
PRP therapy uses concentrated growth factors from your own blood to support healing and reduce inflammation.
Not sure which treatment is right for you? Our specialists will walk you through every option. Book a consultation now.
What Surgical Options Are Available for Thumb Arthritis?
When conservative treatment is no longer effective, or when arthritis has progressed to Stage III or Stage IV, surgery may be recommended.
Trapeziectomy with Ligament Reconstruction and Tendon Interposition (LRTI)
The trapezium bone is removed, and a tendon is used to stabilize the joint space. This is the most commonly performed procedure.
Total CMC Joint Arthroplasty (Joint Replacement)
Damaged joint surfaces are replaced with an implant to preserve motion and thumb length in selected patients.
Arthrodesis (Thumb Fusion)
The joint is permanently fused to eliminate pain, typically used for high-demand patients.
Arthroscopic Debridement
A minimally invasive procedure that removes inflamed tissue in earlier stages of arthritis.
Recovery: What to Expect After Thumb Arthritis Surgery
Recovery varies by procedure and patient factors:
- Weeks 1–6: Immobilization in cast or splint
- Weeks 6–12: Start hand therapy and regain motion
- Months 3–6: Gradual strength recovery
- Months 6–12: Return to full activity in most cases
Hand therapy is essential for optimal recovery outcomes.
Why Choose Academy Orthopedics for Thumb Arthritis Treatment?
- Fellowship-trained hand and wrist surgeons
- On-site Ambulatory Surgical Center in Cumming
- Hospital affiliations with Northside Hospital Forsyth and Duluth
- Membership in ASSH and AAOS
- Convenient locations in Cumming, Buford, and Duluth
- Insurance-friendly care model
Ready to Find Relief from Thumb Arthritis Pain?
Our hand and wrist specialists are ready to help you understand your diagnosis and explore treatment options. For all appointments and inquiries, please call (770) 271-9857 or click here to request an appointment online.
Frequently Asked Questions
What is the difference between basal joint arthritis and CMC arthritis?
They describe the same condition affecting the base of the thumb joint.
What does thumb arthritis feel like? How do I know if my thumb pain is arthritis?
Common signs include pain at the base of the thumb, weakness with gripping, and swelling near the wrist. Diagnosis requires clinical evaluation and imaging.
Can thumb arthritis be treated without surgery?
Yes. Many patients improve with splinting, injections, therapy, and medications.
What is the success rate of thumb arthritis surgery?
Most patients experience significant pain relief and improved function after surgery.
How long does recovery take after CMC joint surgery?
Recovery typically ranges from 3 to 12 months, depending on the procedure.
Is thumb arthritis hereditary?
Genetic factors can increase risk, but do not guarantee the development of the condition.
What makes thumb arthritis worse?
Repetitive gripping, pinching, and heavy use of the thumb joint often worsen symptoms.
At what stage is surgery recommended?
Surgery is typically considered in Stage III or IV when conservative treatment is no longer effective.