34B1.2   Partial articular, lateral sagittal fragmentary fracture

Partial articular, fragmentary, sagittal, fractures of the lateral patella are classified by AO/OTA as 34B1.2 fractures.

They may be due to direct impact to the front of the knee (eg, dashboard injury). The surgeon must not confuse a well-corticated superolateral bipartite patella with an acute fracture.