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Review Question - QID 5535

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QID 5535 (Type "5535" in App Search)
A 25-year-old patent underwent anterior cruciate reconstruction (ACL) surgery 6 months ago. He returns to clinic with persistent instability. Physical examination reveals full range of motion of the knee. Additional tests show a 1A Lachman, 2+ pivot shift, negative external rotation dial, negative reverse pivot shift and negative McMurray. His radiographs are shown in Figure A. What is the likely cause of his persistent symptoms?
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