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Review Question - QID 4713

Distal Radius Fractures Etiology Associated conditions QID: 4713 (OBQ13.78)
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QID 4713 (Type "4713" in App Search)
A 45-year-old construction worker sustains a fall and presents with an isolated injury to his upper extremity. Radiographs of the affected wrist are shown in Figure A. After soft tissue swelling subsides, open reduction and internal fixation of the distal radius is performed. Following fixation, a "shuck" test is performed and shows persistent instability of the distal radioulnar joint. Incompetence of which of the following anatomic structures is the most likely etiology of this finding?
  • A
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  • A