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Home > Specialties > Hip > Stages of Osteonecrosis

What are the different stages of Osteonecrosis?

There are only four "Ficat" stages. Stage 1 has a normal x-ray, but some other diagnostic test is positive (e.g., bone scan, MRI). Stage 2 has changes on plain x-ray but no sign of collapse. Stage 3 has a positive x-ray and signs of collapse (e.g., crescent sign), which is a crescent-shaped chondral lucency ( the fracture of AVN) seen on the plain x-ray. Stage 4 has a positive x-ray and signs of degenerative changes (e.g., osteoarthritis).

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