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There are two knee menisci in each joint: medial and lateral. The menisci are described as having a central body with anterior and posterior horns. In cross-section, they have a triangular (bow-tie) shape, being thicker peripherally and thinning to a free-edge centrally. Each meniscus has a differing shape, size and attachments. http://radiopaedia.org/articles/knee-menisci
Contrasting radiographic features at interphalangeal joints (IPJs) of (A) osteoarthritis (OA): focal narrowing, marginal osteophyte, sclerosis, osteochondral bodies; (B) erosive OA: subchondral erosion; (C) psoriasis: proliferative marginal erosion, retained or increased bone density; and (D) rheumatoid arthritis: non-proliferative marginal erosion, osteopoenia.