Diagnosis

Partial articular, medial sagittal, simple and fragmentary transtrochlear fracture 

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Options
1. Simple transtrochlear fracture through trochlear groove 
2. Simple transtrochlear fracture through medial articular surface 
3. Fragmentary transtrochlear fracture 

1. Simple transtrochlear fracture through trochlear groove 

Simple transtrochlear fracture through trochlear groove

This fracture type is classified by the AO/OTA as 13B2.1.

Take care when approaching any apparently nonarticular medial condylar fracture, as these are unusual. Preoperative imaging, including computed tomography, can be used to identify associated articular fractures.

Simple transtrochlear fracture through trochlear groove

2. Simple transtrochlear fracture through medial articular surface 

Simple transtrochlear fracture through medial articular surface

This fracture type is classified by the AO/OTA as 13B2.2

3. Fragmentary transtrochlear fracture 

Fragmentary transtrochlear fracture

This fracture type is classified by the AO/OTA as 13B2.3.

Most medial condylar fractures in adults feature complex articular comminution. Computed tomography - particularly 3D CT - can help define the fracture anatomy and facilitate planning of the surgery.

Fragmentary transtrochlear fracture