The study aimed to investigate the value of 30°flexed knee MRI in evaluating anterior cruciate ligament (ACL) tears. 64 patients with knee trauma and hospitalized for arthroscopy were included and performed knee MRI in slightly flexed(about 17°) and 30° flexed positions successively. Images of both positions have high sensitivity, specificity and accuracy in diagnosing ACL tears.30°flexion images were superior to 17°in delineating ACL full length, torn ACL’s disrupted sites and ligament remnants, while no significant difference was found in delineating ACL double-bundle structure. Thus 30°flexed knee MRI was recommended in patients suspecting ACL tears.
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