1 MCQs in Medicine for NEET PG
A 64-year-old right-handed woman with 22-year seropositive erosive rheumatoid arthritis presents with difficulty writing and inability to carry grocery bags. Examination reveals symmetric ulnar deviation of all four fingers at the MCP joints bilaterally (>30° on the right, 25° on the left) with volar subluxation of the proximal phalanges. The structure marked **A** in the diagram shows this characteristic deformity. Which of the following is the PRIMARY mechanical factor responsible for the development of ulnar deviation at the MCP joints in chronic rheumatoid arthritis?
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