Avascular necrosis

Bilateral AVN

Bilateral AVN, Grade 4

Right Hip Stage 6

AVN Humeral Head - Snow Caps

Casuses

• Alcoholism
• Steroids
• Post traumatic
• Hypertension
• Vasculitis
• Thrombosis
• Radiation
• Sickle cell anemia

Steinberg Classification for Hips

Stage 0 - Normal radiograph, normal bone scan and MRI

Stage 1 - Normal radiograph, abnormal bone scan and/or MRI

Stage 2 - Abnormal radiograph, cystic and sclerotic changes

Stage 3 - Subchondral collapse, crecent sign

Stage 4 - Flattening of the femoral head

Stage 5 - Joint narrowing w/ or w/out acetabular involvement

Stage 6 - Advanced degenerative change

Kienbock's disease

• AVN of lunate
• Result of repetitive trauma and negative ulnar varience

See Also

Legg Calve Perthes - Idopathic AVN in the femoral head of children.