Type II bipartite patella
12 years boy with pain left knee joint, History of trauma
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There is a bony fragment in the lateral quadrant of the left patella separated by articular cartilage with no evidence of abnormal signal intensity in the bone. There is mild synovial joint effusion.
Bipartite patella is a developmental dysplasia in which the ossification centers fail to fuse. The bipartite fragment situated at the superolateral quadrant of the patella (type III) is by far the most common type occurs in 75% followed by lateral patellar margin (type II) among 20% and inferior margin (type I) among 5%.