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Table 1 Ficat-Alret Classification System

From: Mid-term outcomes of arthroscopic-assisted Core decompression of Precollapse osteonecrosis of femoral head—minimum of 5 year follow-up

Stage Symptoms Radiograph Finding
0 Normal
I Mild Normal
IIa Mild Normal Head Contour, Sclerosis, Cysts
IIb Moderate Flattening of Femoral Head
III Moderate to Severe Collapse, Loss of Sphericity
IV Severe Acetabular Changes