What characterizes Swan-neck Deformity?

• A. Flexion of the PIP joint
• B. Extension of the DIP joint
• C. Both a and b
• D. None of the above

Answer: (C)

Swan-neck deformity is an orthopedic condition that is primarily characterized by a combination of specific joint positions. In this condition, the proximal interphalangeal (PIP) joint is in hyperextension, while the distal interphalangeal (DIP) joint is flexed. This results in a distinctive "Swan-neck" appearance of the fingers.

The combined presentation of these joint positions is crucial for identifying the deformity. Specifically, the extension of the DIP joint is an integral aspect, as it is the flexion of the PIP joint that gives the deformity its characteristic shape. Thus, the statement that both the PIP joint is flexed and the DIP joint is extended highlights the essential features of the deformity, making it the correct choice.

Understanding these joint alignments is important in occupational therapy practice, as it helps inform treatment strategies aimed at managing the deformity and improving function for individuals affected by conditions such as rheumatoid arthritis, which often leads to this deformity.