A. Mallet Finger
B. Trigger Finger
C. Swan Neck Deformity
D. Dupuytren’s Contracture
Ans:C. Swan Neck Deformity.
SWAN NECK DEFORMITY
- Swan neck deformity is a deformed position of the finger, in which the joint closest to the fingertip is permanently bent toward the palm while the nearest joint to the palm is bent away from it (DIP flexion with PIP hyperextension). It is commonly caused by injury or inflammatory conditions like rheumatoid arthritis or sometimes familial (congenital, like Ehlers-Danlos syndrome).
- Primary lesion is lax volar plate that allows hyperextension of PIP.
- Secondary lesion is imbalance of forces on the PIP joint (PIP extension forces that is greater than the PIP flexion force).
- Nonoperative : double ring splint
- Operative : volar plate advancement and PIP balancing with central slip tenotomy