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DOI:10.2214/AJR.07.2921
AJR 2008; 191:W155-W159
© American Roentgen Ray Society

Clinical Observations

MRI Appearance of Posterior Cruciate Ligament Tears

William Rodriguez, Jr.1, Emily N. Vinson1, Clyde A. Helms1 and Alison P. Toth2

1 Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710.
2 Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.

OBJECTIVE. There is little in the radiology literature regarding the MRI appearance of a torn posterior cruciate ligament (PCL). The purpose of this study was to describe the MRI appearance of surgically proven PCL tears and to emphasize previously unreported signs.

CONCLUSION. The PCL is usually injured as the result of stretching deformation; on MRI, the ligament maintains continuity as a single structure with apparent thickening. On sagittal T2-weighted images, an anteroposterior diameter of 7 mm or more is highly suggestive of a torn PCL. Increased intrasubstance signal intensity in the PCL on proton-density images with lower signal intensity on T2-weighted images is another common feature.

Keywords: knee injury • MRI • posterior cruciate ligament


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