knee infrapatellar plica syndrome radiology mri

The infrapatellar plica is one of 4 plicas in the knee:

  • Medial Patella Plica.
  • Suprapatellar Plica.
  • Infrapatellar plica.
  • Lateral Patellar plica.

  • Attaches to anterior intercondylar notch and inferior pole patella.

 

  • Runs through Hoffa's Fat Pad.

 

  • In the joint the infrapatellar plica runs superior and parallel to ACL.

    • The normal appearance of the infrapatellar plica on MRI varies.

     

    • You may not see it at all (most common).

     

    • Or you may see a thin curvilinear region of lower signal running through Hoffa's fat as in the image.

     

    • There should be no high signal seen on STIR/ T2FS along the course of the infrapatellar plica.

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