A 16-year-old soccer player presents to the ED after experiencing a sudden onset of right knee pain during a game when she tried to stop suddenly and felt her knee give out. She denied any contact with another player. She has not been able to weight bear since and has noticed increased swelling of her knee soon after her injury. Given this history, which knee injury do you MOST suspect?

About the Author: Anton Helman

Dr. Anton Helman is an Emergency Physician at North York General in Toronto. He is an Assistant Professor at the University of Toronto, Division of Emergency Medicine and the Education Innovation Lead at the Schwartz-Reisman Emergency Medicine Instititute. He is the founder, editor-in-chief and host of Emergency Medicine Cases.