Swan neck deformity (fingers)
Swan neck deformity is a musculoskeletal manifestation of rheumatoid arthritis presenting in a digit, with the combination of:
- hyperextension of a proximal interphalangeal (PIP) joint
- flexion of a distal interphalangeal (DIP) joint
Pathology
The swan neck deformity characterized by hyperextension of the PIP and flexion of the DIP joints is due to the imbalance of muscle forces .
Swan neck deformity can present in :
- rheumatological disease
- rheumatoid arthritis (classical association)
- scleroderma
- psoriatic arthritis
- systemic lupus erythematosus arthropathy
- neurological
- stroke
- cerebral palsy
- brain injury
- post-traumatic: post mallet finger injury
See also
