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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