The infrapatellar plica (ligamentum mucosum) is a fold of synovial tissue running from the infrapatellar fat pad to the intercondylar notch, a vestige of the embryological knee joint septum. It passes through or adjacent to the intercondylar notch.
| Location | Front of the knee joint, inside the intercondylar notch in front of the anterior cruciate ligament |
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| Boundaries |
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An embryological remnant of the septum that once divided the knee into separate compartments. It has no important mechanical role, but it can obscure the view or be mistaken for the ACL during arthroscopy.
The infrapatellar plica may limit visibility during knee arthroscopy by obstructing the view of the intercondylar notch. It is routinely partially resected to create the notchplasty view window. Symptomatic infrapatellar plica syndrome is less common than medial or suprapatellar plica syndrome.
Routine partial or complete infrapatellar plica resection to improve visualisation of the intercondylar notch during knee arthroscopy, with plica tissue sent for histological examination when inflamed.
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