TABLE VI.
Dorr Classification of Femoral Bone67
| Type | Characteristics |
|---|---|
|
| |
| A | Thick, distinct cortices on anteroposterior and lateral radiographs, “champagne flute” appearance, and cortical thickness index* of <0.5 |
| B | Indicates bone loss from medial and posterior cortices, wider diaphyseal canal, thinning of posterior cortex on lateral radiographs, and cortical thickness index of 0.5 to 0.75 |
| C | Substantial loss of medial and posterior cortices, “stovepipe” appearance, thinning of cortices on both anteroposterior and lateral radiographs, and cortical thickness index of >0.75 |
*
Cortical thickness index is the ratio of the difference between the diaphyseal diameter and canal diameter, divided by the diaphyseal diameter, 10 cm distal to the midportion of the lesser trochanter.