Arthrographic and anatomical research of the posterior region of the medial meniscus were performed in 27 cadaver knees. In all cases the anatomical recesses were found. Also we found the arthrographic recesses in 4 knees, especially in the posterior horn reflecting the anatomical recesses. The anatomical recess at the posterior horn was bigger than the one at the posterior segment. In the clinical case we predicted that the arthrographic recess in the posterior horn was normal becase of reflecting the anatomical recess.