What are the possible causes of transient swelling and pain in the hand of a 61‑year‑old man three years after a hand injury, now resolved with meloxicam and without fever, chills, or weight loss?

Differential Diagnosis for Transient Hand Swelling and Pain at Prior Injury Site

The most likely diagnosis in this 61-year-old male with transient swelling and pain at a remote hand injury site that resolved with meloxicam is post-traumatic osteoarthritis, though tenosynovitis, chronic inflammatory changes, and less likely late-onset complex regional pain syndrome should be considered.

Primary Diagnostic Considerations

Post-Traumatic Osteoarthritis (Most Likely)

• The response to meloxicam (an NSAID) strongly suggests an inflammatory arthritis process 1
• Post-traumatic osteoarthritis commonly develops years after hand injuries and presents with episodic pain and swelling 1
• The transient nature with complete resolution on NSAIDs is characteristic of inflammatory flares in osteoarthritis 1
• Hand OA typically presents with pain, stiffness, and soft tissue swelling at times, which can be episodic 1

Tenosynovitis or Tendon Pathology

• Chronic tenosynovitis can develop at sites of prior trauma and present with intermittent swelling and pain 1
• The superficial location of hand tendons makes them vulnerable to injury and subsequent chronic inflammation 1
• NSAIDs effectively treat tenosynovitis, explaining the rapid resolution with meloxicam 2

Chronic Inflammatory Changes

• Scar tissue and adhesions from the original injury can cause episodic inflammatory responses 1
• These may flare with overuse or minor reinjury and respond well to anti-inflammatory medications 1

Less Likely but Important Considerations

Late-Onset Complex Regional Pain Syndrome (CRPS)

• CRPS can develop years after the initial injury, though this is uncommon 3
• However, the absence of persistent symptoms, complete resolution with NSAIDs alone, and lack of characteristic features (no temperature changes, color changes, or progressive symptoms) make this unlikely 3
• CRPS typically presents with more severe, persistent pain that doesn't fully resolve with simple NSAIDs 3

Infection (Unlikely Given Clinical Course)

• Deep space infection or abscess would not resolve with meloxicam alone and would typically present with fever, progressive symptoms, and systemic signs 4
• The absence of fever, chills, and complete resolution with NSAIDs effectively rules out active infection 4
• Cellulitis would require antibiotics and would not respond to NSAIDs alone 5

Recommended Diagnostic Approach

Initial Evaluation

• Start with plain radiographs of the hand, which are the appropriate initial imaging study for chronic hand pain 1
• Look specifically for:
  • Joint space narrowing indicating osteoarthritis 1
  • Bony deformities or malalignment from prior trauma 1
  • Osteophyte formation 1
  • Signs of old fracture malunion or nonunion 1

If Radiographs Are Normal or Show Only Nonspecific Arthritis

• Consider ultrasound of the hand as the next step if tendon pathology is suspected 1
• Ultrasound can identify synovitis, joint effusion, tenosynovitis, and tendinopathy with 76% diagnostic contribution in hand pain evaluation 1
• MRI without IV contrast is appropriate if radiographs are inconclusive and more detailed soft tissue evaluation is needed 1
• MRI can demonstrate arthritis, tendinopathy, tenosynovitis, ligament injury, and other soft tissue abnormalities 1

Management Implications

Conservative Treatment (Appropriate Initial Approach)

• The patient's response to meloxicam validates continued NSAID therapy for symptom control 1, 2
• Topical NSAIDs are preferred over systemic treatments for hand OA when applicable 1
• Oral NSAIDs should be used for symptom relief for limited duration 1
• Consider step-wise approach: injectable meloxicam for acute flares (3-5 days) followed by oral formulation (7.5-15 mg) for 14 days 2

Clinical Pitfalls to Avoid

• Do not dismiss recurrent symptoms as "just arthritis" without imaging confirmation 1
• Retained foreign bodies can present years later with intermittent swelling and should be excluded with imaging if there was penetrating trauma 1, 5
• Monitor for red flags: fever, progressive swelling, systemic symptoms, or failure to respond to NSAIDs would necessitate urgent re-evaluation for infection 4
• If symptoms become chronic or progressive despite NSAIDs, advanced imaging (ultrasound or MRI) is warranted 1