Abstract
The suprapatellar pouch and the subrapatellar plica are variable structures of the proximal cavity of the knee joint Morphologic examinations of 210 adult knee joints and radiologic studies of 2056 arthrograms revealed four variants of the subrapatellar septum between the subrapatellar bursa and the knee joint cavity: A complete, a perforated, a residual and an extinct septum (type I-IV). In several cases, a lateral subrapatellar recess was found. A similar structure on the medial side was not seen. Massive extension of the suprapatellar pouch or rupture of the suprapatellar bursa with pseudocyst formation both due to increased intraarticular pressure could be represented. They should be taken into account if suprapatellar pain occurs.
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