Pain at the base of the thumb can make surprisingly ordinary tasks difficult. Opening a jar, turning a key, pinching a clip, gripping a golf club, using pruning shears, lifting a pot, or even holding a phone can suddenly hurt.
One common reason is thumb carpometacarpal osteoarthritis, often called thumb CMC arthritis, basal-joint arthritis, or thumb-base arthritis. The painful joint is where the first metacarpal meets the trapezium, a small wrist bone that allows the thumb to move through the wide arc needed for pinch and opposition.
Because the thumb contributes so much to hand function, a relatively small arthritic joint can create a large practical problem. The good news is that treatment usually begins without surgery, and the best plan depends on how much the arthritis affects pain, pinch strength, work, hobbies, and daily life.
This guide explains what thumb CMC arthritis feels like, how it is diagnosed, what nonsurgical treatments have the best evidence, when injections may be considered, and when surgery becomes a reasonable conversation.
What is thumb CMC arthritis?
The carpometacarpal joint at the base of the thumb is a saddle-shaped joint. Its shape gives the thumb exceptional mobility, but it also concentrates force during pinching and gripping.
In osteoarthritis, the joint changes over time. Cartilage becomes thinner and less smooth, the underlying bone remodels, osteophytes or bone spurs may form, and the joint can become inflamed or unstable. As the disease advances, the thumb metacarpal may shift and the mechanics of the entire thumb can change.
The result is not simply an “old joint.” It is a mechanical and biologic process that can produce pain, stiffness, weakness, and loss of function.
Where does thumb CMC arthritis hurt?
The classic symptom is pain at the base of the thumb, near the wrist crease on the thumb side of the hand.
Patients often notice pain with:
- Pinching a key or turning a key in a lock
- Opening jars or bottle caps
- Turning doorknobs
- Gripping tools, weights, paddles, clubs, or handlebars
- Carrying a heavy plate or pan
- Writing or using scissors
- Using garden tools
- Twisting lids
- Texting or holding a phone for long periods
- Repetitive fine-motor work
The joint may also become tender or swollen. Some people notice a bony prominence at the thumb base or feel that the thumb is weaker than it used to be.
As arthritis becomes more advanced, the first metacarpal can drift toward the palm while the thumb MCP joint compensates by bending backward. This can make pinch mechanics less efficient.
Is thumb-base pain always arthritis?
No. Several conditions can produce pain in a similar area.
Possibilities include:
- De Quervain tenosynovitis
- Flexor or extensor tendon irritation
- Scaphoid or other wrist pathology
- Trigger thumb
- Carpal tunnel syndrome with referred discomfort
- Prior fracture or ligament injury
- Inflammatory arthritis
- Ganglion or other soft-tissue lesions
That is one reason diagnosis matters before committing to repeated injections, bracing, or surgery.
A clinician will usually ask exactly where the pain is, what movements reproduce it, whether there is numbness or clicking, whether there was an injury, and how much function has changed.
How is thumb CMC arthritis diagnosed?
The diagnosis often comes from the history, physical examination, and plain X-rays.
During the examination, the clinician may assess:
- Tenderness directly over the CMC joint
- Pain with pinch or grip
- Thumb motion
- Joint stability
- MCP hyperextension
- Crepitus or grinding
- Strength
- Sensation and nerve function
- Nearby tendons and wrist structures
A CMC grind or compression-rotation maneuver can reproduce symptoms in some patients, but no single physical test should be interpreted in isolation.
What do X-rays show?
X-rays can demonstrate:
- Joint-space narrowing
- Bone spurs
- Subchondral sclerosis
- Cysts
- Subluxation or shifting of the metacarpal
- Involvement of nearby joints
The severity of the X-ray does not perfectly predict pain. Some people have advanced-looking arthritis but remain functional, while others have substantial pain with less dramatic imaging.
Treatment should therefore be based on the patient’s symptoms and goals, not simply the radiographic stage.
Do I need an MRI for thumb arthritis?
Usually not.
If the examination and X-rays clearly show symptomatic thumb CMC arthritis, MRI generally does not add much. MRI may be helpful when the diagnosis is uncertain or another soft-tissue or bone problem is suspected, but it is not routinely required to decide whether a brace, therapy, injection, or surgical discussion is appropriate.
What treatments should usually be tried first?
Most patients begin with nonsurgical care.
The 2019 American College of Rheumatology/Arthritis Foundation guideline strongly recommends first-CMC hand orthoses for thumb-base osteoarthritis. The same guideline also supports a broader multimodal osteoarthritis approach that can include exercise, topical or oral medications when appropriate, and individualized self-management.[1]
A systematic review of nonsurgical thumb-base arthritis treatment also found evidence supporting orthoses and rehabilitative approaches, although the quality of many studies was limited.[2]
1. Activity modification
This does not mean “stop using your hand.” It means changing how force is applied across the painful joint.
Examples include:
- Using larger handles or jar-opening aids
- Using two hands instead of a strong one-handed pinch
- Reducing prolonged forceful pinch
- Switching tools or grips
- Taking short breaks during repetitive tasks
- Using adaptive kitchen or work equipment
For many patients, these changes preserve independence while reducing repeated joint loading.
2. A thumb CMC brace or orthosis
A properly selected brace can support the base of the thumb and reduce painful motion while still allowing the fingers to work.
Options include:
- Soft neoprene thumb-spica braces
- Rigid or semi-rigid CMC stabilizing braces
- Custom thermoplastic orthoses made by a hand therapist
The best brace is the one that actually supports the painful joint and is comfortable enough to use consistently.
Some patients use a brace during activities that provoke symptoms rather than wearing it all day.
3. Hand therapy and exercise
Therapy can focus on joint protection, thumb positioning, mobility, strength, and efficient pinch mechanics.
A 2024 systematic review and meta-analysis of randomized trials found that exercise-based interventions can improve pain and disability in thumb CMC osteoarthritis, although the optimal exercise program remains uncertain.[3]
A hand-therapy program may include:
- Thenar and first dorsal interosseous strengthening
- Gentle range-of-motion work
- Isometric stabilization
- Functional retraining
- Joint-protection strategies
- Splint fitting and modification
The goal is not to “exercise away” cartilage loss. The goal is to improve how the thumb functions around an arthritic joint.
4. Topical or oral medication
Depending on medical history, topical anti-inflammatory medication may be useful because it can deliver treatment to a superficial joint with less systemic exposure than oral medication.
Oral NSAIDs may also help selected patients, but they are not appropriate for everyone. Kidney disease, stomach ulcer or bleeding history, cardiovascular disease, anticoagulants, and medication interactions all matter.
Acetaminophen may be considered in some circumstances, although its effect on osteoarthritis pain is generally modest.
Medication should be matched to the individual patient rather than used indefinitely without reassessment.
Do injections help thumb CMC arthritis?
Injections are sometimes considered when bracing, activity modification, and medication are not enough, particularly when pain is interfering with function.
Corticosteroid injection
Corticosteroid injection is commonly used, but the evidence is less straightforward than many patients expect.
A comprehensive systematic review found that the evidence for nonsurgical thumb-base arthritis treatments was mixed and that steroid injections did not consistently outperform saline injection in the included trials.[2] A 2026 scoping review found that image guidance improves injection accuracy in some settings, but also concluded that robust evidence showing that image guidance improves clinical outcomes remains limited.[4]
In practice, some patients do report meaningful temporary relief after a corticosteroid injection, while others notice little benefit.
Important considerations include:
- Relief is not guaranteed
- Benefit may be temporary
- Repeated injections should not become a substitute for reassessing the diagnosis and treatment plan
- Injection accuracy can be difficult in a small arthritic joint
- Infection, skin changes, transient blood-sugar elevation, and other injection-related risks should be discussed
An injection is best viewed as one tool in the treatment pathway, not a cure for arthritis.
What about PRP, hyaluronic acid, or other biologic injections?
These treatments have been studied, but the evidence is not strong enough to consider them universally established first-line care for thumb CMC osteoarthritis.
Patients should be cautious about expensive treatments marketed with claims of “regrowing cartilage” or permanently reversing arthritis. The key questions are whether a treatment has good-quality evidence for meaningful pain and function improvement, how long any benefit lasts, what it costs, and what alternatives exist.
When should surgery be considered?
Surgery becomes more reasonable when several things are true at the same time:
- The diagnosis is clear
- Pain is persistent and substantial
- Pinch, grip, work, hobbies, or daily function are meaningfully limited
- Appropriate nonsurgical treatment has not provided enough relief
- The patient understands the recovery and tradeoffs
- The expected benefit outweighs the risks
There is no required X-ray stage and no mandatory number of injections before surgery.
The decision is about symptoms, function, goals, and informed preference.
What operations are used for thumb CMC arthritis?
Several procedures exist, and terminology can be confusing.
Trapeziectomy
A trapeziectomy removes the trapezium, the small arthritic wrist bone that forms one side of the CMC joint.
Variations may add ligament reconstruction, tendon interposition, suture-button suspension, or other stabilization techniques.
A 2025 systematic review and network meta-analysis of randomized trials found that simple trapeziectomy performed very well for pain relief and had a favorable complication profile compared with many alternative surgical techniques.[5]
This does not mean every patient should have exactly the same operation. Age, activity demands, joint pattern, adjacent-joint arthritis, surgeon experience, and patient preference all matter.
Joint replacement
Thumb CMC joint replacement aims to preserve motion with an implant.
A 2024 meta-analysis of randomized trials found that total joint arthroplasty may provide faster early improvement in some outcomes, but at one year it did not provide a clinically important pain advantage over trapeziectomy. The authors also noted uncertainty about longer-term revision risk.[6]
That tradeoff is important. A faster early recovery can be attractive, but durability and revision considerations matter in a small, highly loaded joint.
Arthrodesis
Fusion may be considered in selected patients, particularly when stability and power are priorities, but it sacrifices CMC motion and has its own risks, including nonunion and stress on adjacent joints.
It is not the default operation for every patient with thumb arthritis.
How long is recovery after thumb CMC surgery?
Recovery is measured in months, not days.
The exact timeline depends on the procedure, surgeon protocol, healing, and the patient’s work demands.
Typical phases may include:
- Postoperative splinting or casting
- Transition to a removable brace
- Progressive thumb motion
- Hand therapy
- Gradual strengthening
- Return to heavier pinch and grip later in recovery
Swelling and weakness can persist for months even when the operation is healing normally.
Patients with jobs requiring heavy gripping, lifting, tools, or repetitive pinch may need a different return-to-work timeline from someone who primarily types or performs light office work.
Does a bigger surgery give a stronger thumb?
Not necessarily.
One of the most important lessons from comparative surgical research is that more complicated reconstruction does not automatically translate into better long-term pain relief or fewer complications.[5]
The goal is not to perform the most technically elaborate procedure. It is to choose a reliable procedure that fits the patient’s anatomy, priorities, and acceptable recovery profile.
Can thumb arthritis come back after surgery?
After trapeziectomy, the original arthritic trapeziometacarpal joint has been removed, so the same joint does not “grow back.”
However, patients can still have pain from:
- Adjacent-joint arthritis
- Scar sensitivity
- Tendon irritation
- Instability
- Nerve symptoms
- Complex regional pain syndrome
- Persistent weakness or stiffness
- Other hand or wrist conditions
That is why careful diagnosis matters before surgery and why postoperative rehabilitation is part of the treatment, not an optional extra.
What happens if I do nothing?
Thumb CMC arthritis does not always progress at the same rate, and symptoms can fluctuate.
If pain is mild and function is good, observation is reasonable. Treatment is not required simply because an X-ray shows arthritis.
If symptoms are worsening, however, it is worth reassessing because patients can begin to compensate in ways that affect pinch mechanics, the MCP joint, and overall hand function.
The key question is not whether arthritis exists. It is whether it is interfering enough with your life that treatment would be worthwhile.
When should thumb pain be evaluated sooner?
Seek prompt evaluation for:
- A new deformity after trauma
- Significant swelling after an injury
- Inability to move the thumb after an acute event
- Numbness or weakness that is new or progressive
- A pale, blue, or unusually cold thumb
- Redness, warmth, drainage, fever, or concern for infection
- Severe pain after a fall or direct blow
These symptoms are not typical “routine arthritis” complaints and may indicate fracture, tendon injury, nerve injury, infection, or another problem.
Thumb arthritis and everyday life in Hawai‘i
Thumb-base arthritis often becomes most noticeable during the activities patients are trying to keep doing, not while sitting still.
That can mean gripping a paddle, holding handlebars, using fishing gear, lifting dive equipment, working with tools, gardening, cooking, golfing, or simply carrying bags and groceries.
The treatment plan should therefore be built around what your hand needs to do, not just around the X-ray.
Pacific Bone & Joint’s hand and upper-extremity services include evaluation of hand and wrist pain, and treatment can range from bracing and activity modification to injections or surgery when appropriate.
Questions to ask before deciding on treatment
Useful questions include:
- Is my pain actually coming from the CMC joint?
- How advanced is the arthritis on X-ray?
- Would a brace likely help?
- Would hand therapy be useful for my goals?
- Is a topical medication reasonable for me?
- What is the expected benefit of an injection in my case?
- If I choose surgery, what procedure do you recommend and why?
- What are the tradeoffs between trapeziectomy, reconstruction, fusion, and implant arthroplasty?
- How long will I be limited from work, lifting, sport, or hobbies?
- What complications are most relevant to me?
- What happens if I wait?
A good treatment decision should make sense after the diagnosis, evidence, recovery, and alternatives are explained together.
The bottom line
Thumb CMC arthritis is a common cause of pain with pinching, gripping, opening jars, turning keys, and other everyday tasks.
Treatment usually starts with activity modification, a well-fitted thumb CMC brace, exercise or hand therapy, and appropriate medication. Injections may provide temporary benefit for some patients, but the evidence is mixed and relief is not guaranteed. Surgery becomes reasonable when pain and loss of function remain substantial despite appropriate nonsurgical care.
When surgery is needed, evidence supports trapeziectomy as a dependable foundation of treatment, while more complex reconstruction or implant procedures should be chosen for specific reasons rather than because they sound more advanced.[5][6]
The best plan is the one that restores useful hand function with the least treatment necessary to reach the patient’s goals.
If pain at the base of your thumb is making pinch, grip, work, or daily tasks difficult, request an orthopedic evaluation so the diagnosis, X-rays, and treatment options can be reviewed together.
Sources and Further Reading
- Kolasinski SL, Neogi T, Hochberg MC, et al. 2019 American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee. Arthritis Rheumatol. 2020;72(2):220-233. doi:10.1002/art.41142. https://acrjournals.onlinelibrary.wiley.com/doi/10.1002/art.41142
- Hamasaki T, Laprise S, Harris PG, et al. Efficacy of Nonsurgical Interventions for Trapeziometacarpal (Thumb Base) Osteoarthritis: A Systematic Review. Arthritis Care Res (Hoboken). 2020;72(12):1719-1735. doi:10.1002/acr.24084. https://pubmed.ncbi.nlm.nih.gov/31600038/
- Exercise-Based Interventions Are Effective in the Management of Patients with Thumb Carpometacarpal Osteoarthritis: A Systematic Review and Meta-Analysis of Randomised Controlled Trials. Healthcare (Basel). 2024;12(8):823. doi:10.3390/healthcare12080823. https://www.mdpi.com/2227-9032/12/8/823
- Padmanabhan S, Brewin MP, Steele J. Guided steroid injection for thumb carpometacarpal joint osteoarthritis: a scoping review. 2026. https://journals.sagepub.com/doi/10.1177/17589983261430876
- Kumar AA, Lawson-Smith M, et al. Surgical Management of Thumb Carpometacarpal Osteoarthritis: A Systematic Review, Network Meta-analysis, and Longitudinal Analysis of Surgical Complications. J Hand Surg Glob Online. 2025;7(3):100708. doi:10.1016/j.jhsg.2025.02.001.
- Liukkonen R, Karjalainen VL, Kvist R, et al. Total joint arthroplasty for thumb carpometacarpal joint osteoarthritis: a systematic review and meta-analysis of randomized controlled trials. Acta Orthop. 2024. doi:10.2340/17453674.2024.40816. https://pubmed.ncbi.nlm.nih.gov/38887076/
This article is educational and is not a substitute for individual medical advice. Treatment depends on the diagnosis, examination, imaging when appropriate, medical history, and patient goals.
