Table 2.

Treatment Considerations Based on Lesion Collapse and Staging

Radiographic Presentation	Ficat Stages	ARCO Stages	UPenn Stages	Treatment Considerations
Precollapse	I II	I II	0 I II III	Risk factor modification when possiblePercutaneous drillingCore decompression±Stem cell augmentationBone graftingOsteotomy (location-based)
Collapse	III IV	IIIA IIIB IV	IV V VI	Bone graftingTotal hip arthroplasty (definitive)

ARCO = Association Research Circulation Osseous