United unresorbed medial and lateral plicae as anterior mesenchymal synovial septal remnant
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Mesenchymal tissue that forms compartments in the knee joint begins to be resorbed in the 8th week of embryologic life. Unless these mesenchymal tissues are totally resorbed, they remain as septal remnants, and are termed mediopatellar, infrapatellar, suprapatellar, and lateral plicae. We report a case of united anterior plica; the inferior part of the anterior mesenchymal septum at the back of the patellar tendon was unseparated and unresorbed, and one-half of the superior part of the septum beginning from the inferior pole of the patella formed the V-shaped medial and lateral plicae such that their opening looked upwards.
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