A 45-year-old man presents to the emergency department after a dashboard injury to his right knee during a motor vehicle accident. On examination, he has significant knee pain and swelling. A lateral knee X-ray is obtained. The structure marked **A** in the diagram is the patella. On careful inspection, you note that the patella appears to be positioned lower than expected relative to the femoral condyles, and the Insall-Salvati ratio is measured at 0.75. Which of the following is the most likely associated injury?
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