Causes of acute hemarthrosis of the knee

Injury
Anterior cruciate ligament tear	70-72%
Patellar subluxation or dislocation	10-15%
Peripheral meniscal tear	10%
Osteochondral fracture	2-5%
Posterior cruciate tear, capsular tear, other	5%

Modified with permission from Baker C. Journal of MAG 1992; 81:301.

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