DIP joint deformity

What is a Swan Neck Deformity? Swan-neck deformity (SND) is a finger deformity characterized by proximal interphalangeal joint (PIP) hyperextension and distal interphalangeal joint (DIP) flexion. There may also be reciprocal flexion of the metacarpal phalangeal joint (MCP). A Swan-Neck Deformity is caused by an imbalance in the digit’s extensor mechanism. At the PIP joint,…