Ulnar deviation

An angular deformity in which the fingers or wrist are displaced toward the ulna at the metacarpophalangeal or radiocarpal joints, typically resulting from chronic synovitis, ligamentous laxity, or joint destruction.

Causes

• Inflammatory arthritis

  • Rheumatoid arthritis (classic association)

  • Psoriatic arthritis

  • Systemic lupus erythematosus (SLE)

• Degenerative osteoarthritis

• Congenital causes

  • Brachial plexus palsy

  • Diastrophic dysplasia

• Traumatic causes

  • Severe hand or wrist trauma

  • Malunited fractures

  • Ligament injuries