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Hip Avascular Necrosis (AVN) occurs when blood supply to the femoral head (hip ball) is disrupted, leading to bone death. AVN of the hip is most common between 30-65 yrs and it affects >30,000 people in the US each yr. #AvascularNecrosis changes can be tracked through distinct stages seen on imaging studies (X-ray/MRI). . AVN Staging (seen on radiograph): 🔹 Stage I - normal or minor osteopenia 🔹 Stage II: mixed osteopenia, sclerosis and/or subchondral cysts, w/o subchondral lucency 🔹 Stage III: crescent sign (linear cleft due to a subchondral fracture), early femoral head cortical collapse #hipxray 🔹 Stage IV: end-stage femoral head collapse, secondary degenerative change *Early detection is crucial! MRI can detect AVN with up to 90% accuracy even before any #HipXray changes appear. More info on risk factors, symptoms, treatment options up soon. . Staging #AVN Challenge X-rays (see hip x-rays in story, and YOU make the diagnosis): 🔸 Hip A: Stage II AVN - joint space narrowing (distance between femoral head - hip socket or acetabulum), subchondral sclerosis (dense, bright white area due to bone hardening just below cartilage surface) #hippain 🔸 Hip B: Stage IV AVN - partial collapse (flattening) of femoral head, secondary degenerative changes including subchondral sclerosis, irregularity, osteophytes . 👇 SHARE your Hip AVN experience & insights - How easy was it to spot AVN on the x-rays? #orthopaedicsurgery