Patellar fractures are classified according to Holt and Larson. The transverse fractures is the most common, resulting from a direct blow. Others include vertical, comminuted, and avulsed. Differentiation is made from a bipartite patella, located usually at the superolateral margin.
AP radiograph of the knee. No definite fracture is seen.
Lateral radiograph of the knee. This depicts the fracture through the inferior pole of the patella.
