College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What is a characteristic feature of a Swan Neck Deformity?

Thumb opposition
Thumb extension
PIP joint hyperextension
DIP joint extension

The correct answer is: PIP joint hyperextension

A characteristic feature of a Swan Neck Deformity is hyperextension of the proximal interphalangeal (PIP) joint. This particular deformity is typically seen in conditions such as rheumatoid arthritis and presents with the PIP joint extended while the distal interphalangeal (DIP) joint is flexed. This creates the classic "swan neck" appearance of the fingers. Understanding this deformity involves recognizing how the ligaments and tendons around the fingers are affected, leading to the noted change in joint positioning. The other options relate to thumb movements or positions that do not specifically describe the deformity characterized by the hyperextended PIP joint.