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.
Acts as a synovial fold providing lubricating fluid distribution within the anterior knee compartment and is a remnant of the embryological partitioning of the knee joint.
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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