I held a heavy weight with my thumb on a thin stainless steel mandrel while melting glass; two months later the thumb carpometacarpal joint remains painful and functionally limited. What is the likely injury and what evaluation and treatment should be pursued?

Immediate Evaluation and Management of Suspected Thumb CMC Joint Injury

You need urgent hand surgery evaluation for a likely thumb carpometacarpal (CMC) joint injury—either ligamentous damage, dislocation, or instability—that has failed to heal after two months of persistent pain and functional limitation.

Understanding Your Injury

Your mechanism of injury—sustained compression force through the thumb while holding a heavy weight on a thin mandrel—is consistent with traumatic injury to the thumb CMC joint (the joint at the base of your thumb where it meets the wrist). The combination of:

• Heavy load bearing
• Two months without improvement
• Inability to use the thumb functionally
• Persistent pain

...strongly suggests significant ligamentous injury, possible chronic instability, or even an unrecognized dislocation that may have reduced spontaneously but left residual damage 1.

Critical Diagnostic Steps You Need Now

1. Imaging Evaluation

You need radiographs (X-rays) of your thumb CMC joint immediately 2. Standard views should include:

• PA (posteroanterior) view
• True lateral view
• Stress views to assess joint stability

These are essential because 96% of surgeons rely on radiographs combined with clinical assessment to diagnose CMC instability 2. The X-rays will reveal:

• Joint alignment or subluxation
• Any fracture fragments you may have missed
• Degree of joint space widening under stress
• Early arthritic changes

2. Specialized Hand Examination

You need assessment by a hand surgeon or hand therapist who will specifically evaluate:

• Joint laxity testing: Comparing your injured thumb to the uninjured side
• Grind test: Axial compression with rotation (tests for cartilage damage)
• Stress testing: Radial and ulnar deviation to assess ligament integrity
• Pinch and grip strength: Quantified comparison to your other hand

Treatment Algorithm Based on Findings

If Imaging Shows Instability Without Arthritis:

Initial Conservative Management (4-6 weeks):

• Thumb spica orthosis: Long-term use is advocated for symptom relief in thumb base problems 3
• Hand therapy: Exercises to improve function and muscle strength while reducing pain 3
• Topical NSAIDs: First-line pharmacological treatment due to safety profile 3
• Oral NSAIDs: Limited duration for symptom relief if topical agents insufficient 3

Surgical Intervention if Conservative Fails: Given you're already at 2 months with no improvement, you may need to proceed directly to surgery. Ligament reconstruction is the primary surgical option for nonarthritic CMC instability 4. Multiple techniques exist, with the Eaton-Littler ligament reconstruction being most commonly used (32% of surgeons) 2. All reported techniques show:

• Improved postoperative pain scores
• Substantial improvement in pinch and grip strength
• High patient satisfaction 4

If Imaging Shows Arthritis Development:

You would follow the thumb base osteoarthritis pathway:

• Initial conservative management as above
• Consider intra-articular corticosteroid injection for painful flares (though evidence is mixed) 5
• Surgery becomes indicated when conservative treatments fail and you have marked pain/disability 5
• Surgical options include trapeziectomy (removal of the trapezium bone), with simple trapeziectomy preferred over combined procedures due to lower complication rates 5

Critical Pitfalls to Avoid

1. Don't delay further: Two months without improvement is already concerning. Chronic untreated instability can lead to progressive arthritis 1

2. Don't accept "it will get better with time": Ligamentous injuries that haven't improved by 6-8 weeks typically require intervention

3. Ensure proper diagnosis: CMC instability is "widely recognized but remains inconsistently defined, diagnosed, and managed" 2. You need a hand specialist, not general orthopedics

4. Don't undergo combined surgical procedures if surgery is needed: Evidence shows combination procedures (like trapeziectomy + ligament reconstruction + tendon interposition) offer no advantage over single procedures but have higher complication rates (RR = 2.12) 5

Your Next Steps Tomorrow

1. Call a hand surgeon for urgent evaluation (not just orthopedics—specifically hand surgery)
2. Request thumb CMC radiographs including stress views
3. Begin thumb spica splinting immediately while awaiting evaluation
4. Start topical NSAIDs (diclofenac gel) to the thumb base three times daily

The bottom line: Your functional limitation and persistent pain at 2 months post-injury demands specialist evaluation and likely surgical intervention to restore thumb function and prevent permanent disability.