Diagnosis

Complete articular, frontal/coronal fracture (AO/OTA 34C1)

print

These fractures are characterized by a transverse fracture with complete disruption of the extensor apparatus of the knee.

They may be due to a hyperflexion injury, with a sudden quadriceps contraction when the knee is flexed. This is typical in the middle-aged adult as a mechanism.

The patellofemoral joint surface may be injured, associated with impaction deformation of the patellar joint surface that can be difficult to restore anatomically and stably.

If the fragments are separated the extensor mechanism is usually disrupted.

Options
1.  Complete articular, frontal/coronal simple fracture of the middle third (AO/OTA 34C1.1)
2.  Complete articular, frontal/coronal simple fracture of the proximal third (AO/OTA 34C1.2)
3.  Complete articular, frontal/coronal simple fracture of the distal third (AO/OTA 34C1.3)

1.  Complete articular, frontal/coronal simple fracture of the middle third (AO/OTA 34C1.1)

When the fracture occurs through the middle third of the patella, it is classified by AO/OTA as a 34C1.1 fracture.

2.  Complete articular, frontal/coronal simple fracture of the proximal third (AO/OTA 34C1.2)

When the fracture occurs through the proximal third of the patella, it is classified by AO/OTA as a 34C1.2 fracture.

3.  Complete articular, frontal/coronal simple fracture of the distal third (AO/OTA 34C1.3)

When the fracture occurs through the distal third of the patella, it is classified by AO/OTA as a 34C1.3 fracture.

These intraarticular fractures occur when the distal third of the patella is avulsed from the body of the patella.