General Internal Medicine Question 53

A 28-year-old man is evaluated for right knee pain that began 2 days ago. He was playing football when he stopped suddenly and pivoted to make a catch. He heard a popping sound and immediately developed severe pain in his right knee. Within 30 minutes, the knee became swollen. Since the injury, he has been able to bear weight, but he has discomfort with ambulation and reports feeling that his right knee is going to buckle. He has also been unable to participate in any further sports activities. Medical history is unremarkable. He takes no medications. On physical examination, vital signs are normal. BMI is 24. The right knee is swollen with a palpable effusion. There is no overlying erythema, medial or lateral joint line tenderness, or increased laxity with varus and valgus forces. Anterior drawer and Lachman tests are positive. Posterior drawer test is negative. Which of the following is the most likely diagnosis?

A Anterior cruciate ligament tear

B Lateral collateral ligament tear

C Medial collateral ligament tear

D Meniscal tear

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