hello. i am a high school and small college basketball official. had game early this afternoon. i planted my right leg and turned quickly to follow the flow of the game. i immediately felt something pop in my knee. not much pain at first but gradually worsening the last couple of hours. cant hardly straighten my leg without pain. also testing the leg and knee to turn is painful. small swelling on front of knee. im 32 yrs old and been athlete all my life and a sports official for the past 10 yrs. never had knee problems, but have broken ankles, arms, nose, etc. what do you think? thank you