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It's not that easy... there are signs - such as a positive Lachman's Test or positive Anterior Draw Test... but the Mechanism of Injury tells more of the story...
Could you give me some more info... where exactly is the pain? What where you doing when you first felt the pain? Did you fall.... where you hit in the knee with your foot planted, where you trying to change direction... is there any swelling or bruising.... stuff like that...