Classification of D'Antonio et al for Femoral Defects Affecting a Total Hip Arthroplasty

D'Antonio et al classified defects in the femur that may be encountered when performing a total hip arthroplasty.

Femoral Defect	Description	Type
segmental defect	loss of femoral cortical bone support	I
cavitary defect	loss of cancellous or endosteal cortical bone without violation of the outer cortical shell	II
combined segmental and cavitary defects		III
malalignment	distortion of the femoral architectural geometry in either the rotational or angular plane	IV
femoral stenosis	partial or complete occlusion of the intra-medullary canal	V
femoral discontinuity	loss of femoral bone integrity, most often the result of fracture or nonunion	VI

where:

• Ectasia is a form of cavitary defect in which there is expansion of the femoral medullary cavity.

Location of a Segmental Defect	Level
proximal to or at the lower end of the lesser trochanter	I
from the lower end of the lesser trochanter to a point 10 cm from the lesser trochanter	II
distal to a point 10 cm from the lesser trochanter	III

A patient may have 1 or more defect types present.

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