MRI Knee - Sagittal T1 - Normal ACL

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MRI Knee - Sagittal T1 - Normal ACL

  • The normal anterior cruciate ligament (ACL) is slightly obliquely orientated (superolateral to inferomedial)
  • Sagittal plane MRIs of the knee are angled to optimise views of the ACL
  • On a T1 sagittal image the ACL should appear well-defined and black, as in this image
  • The posterior cruciate ligament (PCL) is only partly visible as it is out of plane with the ACL

MRI Knee - Sagittal T1 - ACL complete tear

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MRI Knee - Sagittal T1 - ACL complete tear

  • The ACL is not visible
  • Its fibres – normally black – are replaced by strands of high signal representing oedema within the torn ligament