37+ Boutonniere Finger Vs Swan Neck PNG. Swan neck vs boutonniere 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).

Hyperextension of a proximal the swan neck deformity characterized by hyperextension of the pip and flexion of the dip joints is due to the imbalance of muscle forces 6.

What do swan neck deformities look and feel like? The trauma and disease processes that cause these deformities vary. Allet fingers, boutonniere deformities, and swan neck deformities are common finger injuries that can be recognized by a hand therapist with a keen eye. The chronic inflammatory changes of rheumatoid arthritis in the joints of the fingers produce retraction of the tendons.