knee swelling

[roycar]

might seem like a silly question but....

what injuries will cause a gross knee effusion?
player was trainin for rugby (6 pm), valgus force to the knee in about 50 degrees flexion with the foot planted. very sore. went home. next morning knee is grossly swollen. i saw the guy, a friend of mine, told him to rice.. said come back in a couple o days thinkin o probably meniscus but when he came back is c/o vague pain around belly of lateral head of gastroc. meniscus tests are negative. ligament tests all negative. cant reproduce this pain at all in examination.... anyway! sorry back to the point! what else will cause gross knee effusion

thanks

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