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The PCL line: An indirect sign of anterior cruciate ligament injury

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      Abstract

      A new sign of anterior cruciate ligament (ACL) tear based on secondary changes of the posterior cruciate ligament (PCL) is described. Thirty-one patients with magnetic resonance (MR) examinations of the knee suspicious for ACL injury and 50 normal controls were examined. In each patient a line was drawn adjacent and parallel to the posterior margin of the distal portion of the PCL and was extended proximally. A positive PCL line did not intersect the medullary cavity of the femur. A positive line correctly predicted ACL injury in 19 of 22 patients.

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