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MR Imaging of Anterior Cruciate Ligament Reconstruction Graft

L. Kimberlee Horton1, Jon A. Jacobson, John Lin and Curtis W. Hayes

1 All authors: Department of Radiology, University of Michigan Medical Center, 1500 E. Medical Center Dr., TC-2910G, Ann Arbor, MI 48109-0326.



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  		Fig. 1A. —19-year-old man with full-thickness anterior cruciate ligament graft tear (patellar tendon autograft). Sagittal (A) and coronal with fat saturation (B) proton density—weighted MR images show discontinuity of graft (arrows) with increased signal. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 1B. —19-year-old man with full-thickness anterior cruciate ligament graft tear (patellar tendon autograft). Sagittal (A) and coronal with fat saturation (B) proton density—weighted MR images show discontinuity of graft (arrows) with increased signal. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 2A. —24-year-old woman with intact anterior cruciate ligament graft (patellar tendon autograft). Sagittal (A) and coronal (B) proton density—weighted MR images show normal low-signal graft fibers (arrows) with uniform thickness and signal intensity. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 2B. —24-year-old woman with intact anterior cruciate ligament graft (patellar tendon autograft). Sagittal (A) and coronal (B) proton density—weighted MR images show normal low-signal graft fibers (arrows) with uniform thickness and signal intensity. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 3A. —17-year-old girl with partial-thickness anterior cruciate ligament graft tear (semitendinosus and gracilis autograft). Sagittal (A) and coronal with fat saturation (B) proton—density weighted MR images show thinning of graft material (arrow); however, intact graft fibers remain. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 3B. —17-year-old girl with partial-thickness anterior cruciate ligament graft tear (semitendinosus and gracilis autograft). Sagittal (A) and coronal with fat saturation (B) proton—density weighted MR images show thinning of graft material (arrows); however, intact graft fibers remain. Note artifacts (arrowheads) from metal interference screws.

 


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  		Fig. 4. —31-year-old woman with full-thickness anterior cruciate ligament graft tear (semitendinosus and gracilis allograft with synthetic graft). Lateral parasagittal proton density—weighted MR image shows anterior tibial translation (distance between arrow and line, >5 mm) and uncovered posterior horn of lateral meniscus (arrow).

 


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  		Fig. 5. —Bar chart shows percentage of occurrence of primary and secondary MR imaging findings after anterior cruciate ligament reconstruction. PHLM = posterior horn of lateral meniscus, PCL = posterior cruciate ligament. Black bars = full-thickness tears; gray bars = partial-thickness tears; and white bars = intact graft.

 


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  		Fig. 6. —Graph shows receiver operating characteristic curves in diagnosis of partial-thickness anterior cruciate ligament graft tear versus other conditions (full-thickness tear or intact graft). {diamondsuit} = observer 1; {blacksquare} = observer 2.

 


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  		Fig. 7. —Graph shows receiver operating characteristic curves in diagnosis of full-thickness anterior cruciate ligament graft tear versus other conditions (partial-thickness tear or intact graft). {diamondsuit} = observer 1; {blacksquare} = observer 2.

 

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