Figure 1
From: Fabellar prevalence, degeneration and association with knee osteoarthritis in the Chinese population
Different degenerated grades of fabellae are shown in lateral knee radiographies. (A) Grade 0, normal fabella, which is oval shaped, and anterior smooth surface is articulated with posterolateral condyle of femur; (B) Grade 1, sclerosis fabella, with anterior surface subchondral sclerosis of the fabella; (C) Grade 2, severe sclerosis of the fabella with osteophyte formation; (D) Grade 3, large fabella with marked osteophyte formation. Arrows point to the fabellae.
