最常见导致急性创伤性血性膝关节的原因是前交叉韧带的撕裂伤。
The most common cause of acute traumatic hemarthrosis of the knee is an anterior cruciate ligament tear.
前侧交叉韧带是连接膝关节顶部和底部的韧带。
The ACL is a ligament that connects the top and bottom portions of the knee.
大多数前交叉韧带损伤的患者都有突发膝关节疼痛，活动受限，肿胀及撕裂声音。
Most patients with an ACL injury will give a history of immediate pain, disability, knee swelling and audible pop.
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