Table 12.2.2 Open in new tab...

Table 12.2.2

Classification of avascular necrosis

Stage	Pain	Radiographic signs	Scintigram	MRI	Intraosseous pressure
Early	None	Normal	Normal	Normal	Increased
I	Minimal	Normal	Nondiagnostic	Early changes	Increased
II	Moderate	Porosis/sclerosis	Positive	Positive	Increased
Late			Positive	Positive	Increased
III	Advanced	Flat/crescent sign	Positive	Positive	Increased
IV	Severe	Acetabular changes	Positive	Positive	Increased

Stage	Pain	Radiographic signs	Scintigram	MRI	Intraosseous pressure
Early	None	Normal	Normal	Normal	Increased
I	Minimal	Normal	Nondiagnostic	Early changes	Increased
II	Moderate	Porosis/sclerosis	Positive	Positive	Increased
Late			Positive	Positive	Increased
III	Advanced	Flat/crescent sign	Positive	Positive	Increased
IV	Severe	Acetabular changes	Positive	Positive	Increased