IPP is an abbreviation for infrapatellar plica.
![relationship of ligamentum mucosum and fat pad](/sites/default/files/users/user1/ligamentum-mucosum-lateral.png)
Side view of the knee, showing how the infrapatellar plica (also known as the ligamentum mucosum) is related to the fat pad.
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Side view of the knee, showing how the infrapatellar plica (also known as the ligamentum mucosum) is related to the fat pad.