Swan Neck Deformity: A Delicate Curve
Understanding Swan Neck Deformity
Swan neck deformity is a finger deformity characterized by a bent shape resembling a swan’s neck. It occurs when the middle joint of a finger (proximal interphalangeal, or PIP joint) bends backward, while the end joint (distal interphalangeal, or DIP joint) bends forward.
Causes of Swan Neck Deformity
- Rheumatoid Arthritis: This autoimmune disease is a common cause, leading to inflammation and damage to the joints.
- Trauma: Injuries to the tendons or ligaments can disrupt the delicate balance of forces in the finger, resulting in deformity.
- Certain Neurological Conditions: Conditions like cerebral palsy or stroke can weaken the muscles and tendons, contributing to the deformity.