Dorr Classification; Bone 1993

"Structural and Cellular Assessment of Bone Quality of Proximal Femur"

A - Thick cortex - champagne flute canal

B - Thin cortex with residual funnel shape

C - Thin cortex - "stove pipe canal"

Canal/Canal Ratio
A - <0.5
B - 0.5 - 0.75
C - >0.75

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