All of the following are types of avascular non-union except:
Classification of non-union:
 Hypervascular non-union:

Elephant foot (hypertrophic , rich in callus)
Horse foot (mildly hypertrophic , poor in callus)
Oligotrophic (non-hypertrophic, no callus)

Avascular non-union:

Torsion wedge
Comminuted
Defect
Atrophic
Comminuted
Elephant foot
Torsion wedge
Atrophic