Developmental		Acquired
High dysplastic	With lysis	Traumatic	Acute fracture
High dysplastic	With elongation	Traumatic	Stress fracture
Low dysplastic	With lysis	Post-surgical	Direct
Low dysplastic	With elongation	Post-surgical	Indirect
		Pathologic	Local
		Pathologic	Systemic
		Degenerative	Primary
		Degenerative	Secondary