Table 1.

Classification of Paprosky et al. [14]

Paprosky type	Acetabular rim	Anterior and posterior columns	Osteolysis	Component migration (from original position)	Bony defect	Kohler’s line
I	Intact, supportive	Intact	None	None	Minimal	Intact
IIA	Distorted	Intact	Minimal ischial and teardrop	Directly superior < 2 cm	Cavitation of dome, intact superior rim	Intact
IIB	Distorted	Intact	Minimal ischial and teardrop	Superolateral migration < 2 cm	Superior rim absent	Intact
IIC	Distorted	Intact	Minimal ischial and teardrop	Medial	Destruction of medial wall	Disrupted
IIIA	Major destruction	Nonsupportive	Moderate ischial and teardrop	Superior migration > 2 cm	Severe bone loss	Intact
IIIB	Major destruction	Nonsupportive	Severe ischial lysis, no teardrop	Superior (and medial) migration > 2 cm	Severe bone loss, possible pelvic discontinuity	Disrupted