1 MCQs in Orthopedics for NEET PG
A 48-year-old woman with seropositive rheumatoid arthritis of 15 years' duration presents with progressive hand deformity and difficulty gripping. Examination reveals symmetrical small-joint synovitis, ulnar deviation at the MCP joints, and swan-neck deformity of the index finger. The structure marked **A** in the diagram shows boutonnière deformity of the middle finger. Which of the following best explains the mechanism of PIP flexion with compensatory DIP hyperextension in this deformity?
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