Bipartite patella

Case contributed by Leonardo Lustosa

Presentation

Fall onto the knee.

Patient Data

Age: 15 years
Gender: Male
x_ray

A small rounded bone component without sclerotic margins is noted at the superolateral aspect of the patella, in keeping with a bipartite patella.

Annotated image

Annotated image highlighting the borders of the patellar components. The secondary bone component is located at the superolateral aspect of the patella, in keeping with a bipartite patella Saupe type 3.

Case Discussion

Bipartite patella, also known as two-part patella, is an anatomical variant with an unfused accessory ossification center, most commonly at its superolateral aspect 1.

Ossification of the patella is normally visible by 3 to 5 years of age 2. The ossification centers of the patella fuse near 12 years of age, and complete ossification usually occurs by the end of puberty 3.

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