Imaging Case of the Week 145 Answer

Patient 1 has a fracture of the superior pole of the patella, involving the articular surface. There is associated joint effusion and intra-articular gas, raising the possibility of an open patellar fracture. This patient had a deep cut on the anterior knee and subsequently underwent emergent joint washout with ORIF of the patella.

 

Patellar fracture

 

Patient 2 has a developmental variant, a bipartite patella, due to an unfused accessory ossification centre at the superolateral aspect. A bipartite patella is often confused with a fracture; it is bilateral in approximately 50% of the cases.

Bipartite patella

 

 

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