Rheumatoid Hand

Rheumatoid Hand - Fiery Fingers Genesis

• Autoimmune basis: Chronic, systemic inflammatory disorder primarily affecting synovial joints.
• Key pathology: Persistent synovitis.
  • Synovial lining cells proliferate (hyperplasia).
  • Forms invasive pannus tissue.
• Destructive cascade:
  • Pannus erodes articular cartilage, subchondral bone, ligaments, and tendons.
  • Tenosynovitis is common; can lead to tendon adhesions or rupture (e.g., Vaughan-Jackson syndrome).
• Result: Joint instability, deformity, and functional loss.

⭐ The earliest pathological changes in rheumatoid arthritis often occur in the synovium of small joints of the hands (MCP, PIP) and feet (MTP).

Deformity Parade - Twisted Manifestations

• Wrist:
  • Radial deviation & carpal ulnar translocation.
  • Volar subluxation.
  • Caput ulnae syndrome: dorsal ulnar head, supination, pain, ↓ rotation, ECU rupture.
• MCP Joints:
  • Volar subluxation/dislocation.
  • Ulnar deviation of fingers. 📌 Mnemonic: "Wind-swept hand".
• PIP/DIP Joints:
  • Swan Neck Deformity: PIP hyperextension, DIP flexion.
  • Boutonnière Deformity: PIP flexion, DIP hyperextension.
• Thumb (Nalebuff Classification):
  • Type I (Most common): MCP flexion, IP hyperextension (Boutonnière-like).
  • Type III: MCP hyperextension, IP flexion (Swan neck-like).
  • Type VI (Arthritis Mutilans): Severe bone resorption, "opera-glass hand".

⭐ Ulnar deviation at MCP joints with wrist radial deviation is classic RA hand appearance (Z-deformity).

Diagnostic Clues - Spotting the Signs

• Symptoms: Symmetrical polyarthritis, morning stiffness >1 hr.
• Signs:
  • MCP, PIP joint swelling & tenderness (DIPs usually spared).
  • Deformities:
    • Ulnar deviation.
    • Swan neck (PIP hyperextension, DIP flexion).
    • Boutonnière (PIP flexion, DIP hyperextension).
    • Z-thumb (MCP flexion, IP hyperextension).
    • Caput ulnae (dorsal ulnar head subluxation).
    • Vaughan-Jackson syndrome (extensor tendon ruptures, 5th→4th).
• Labs: ↑ ESR, CRP; (+) RF; (+) Anti-CCP antibodies.

⭐ Anti-CCP antibodies are highly specific for RA and may predict erosive disease.

Treatment Toolkit - Mending & Modifying

• Goal: ↓Pain, ↑Function, Correct Deformity, Halt Progression.
• Conservative Cornerstone:
  • Pharmacological:
    • DMARDs (Methotrexate, Leflunomide, Sulfasalazine) - 1st line.
    • Biologics (TNF-α inhibitors, Rituximab) - for refractory cases.
    • NSAIDs & Corticosteroids (oral, intra-articular) - for symptom control.
  • Rehabilitation:
    • Splinting: Resting (night), Functional (day).
    • Physiotherapy & Occupational Therapy: ROM exercises, joint protection.
• Surgical Interventions (when conservative fails or severe deformity):
  • Prophylactic: Synovectomy (early, esp. wrist, MCPs).
  • Reconstructive:
    • Tendon surgery: Repair, transfer, tenodesis (e.g., EPL rupture, Caput ulnae syndrome).
    • Arthroplasty: MCP (silicone most common), PIP, Wrist.
    • Arthrodesis: Wrist, Thumb (CMC, MCP, IP), Finger DIPs/PIPs (for stability).

⭐ MCP joint arthroplasty is preferred over fusion to preserve motion, crucial for hand function.

High‑Yield Points - ⚡ Biggest Takeaways

• MCP joints typically exhibit ulnar deviation and palmar subluxation.
• Swan neck deformity is characterized by PIP hyperextension and DIP flexion.
• Boutonniere deformity presents with PIP flexion and DIP hyperextension.
• The most frequent thumb deformity is Nalebuff Type I (Boutonniere-like).
• Extensor tendon ruptures are frequent; EPL rupture at Lister's tubercle is classic (Vaughan-Jackson syndrome).
• Caput ulnae syndrome features dorsal DRUJ subluxation, pain, and supination weakness.
• Key surgical goals include pain relief, improved function, and deformity correction.