A 16-year-old boy comes to the emergency department due to right knee pain after a fall. His symptoms started after a ski accident in which he twisted the right lower leg outward relative to the thigh. He has no medical conditions and currently takes no medications. On examination, there is swelling and tenderness on the medial aspect of the right knee. Widening of the medial joint line can be felt when a gentle force is applied to the lateral knee with the lower leg kept stationary. Which of the following labelled structures is most likely injured in this patient? 
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