Avascular necrosis (AVN) is death of cellular bone components due to disruption of subchondral blood supply, which can lead to collapse of an entire joint in severe cases.
Most common...
Assess for risk factors such as recent trauma, autoimmune disorders, steroid use, alcohol/tobacco use
Signs and symptoms
Often asymptomatic in early disease
Pain is the most...
Initial goals should be directed toward native joint preservation and may include immobilization, restricted weight bearing, physical therapy, and various surgical interventi...
M87.9 Osteonecrosis, unspecified
M87.059 Idiopathic aseptic necrosis of unspecified femur
M87.219 Osteonecrosis due to previous trauma, unspecified shoulder
M87.256 Osteonecrosis due to previo...
AVN is higher on the differential for hip and other joint pain in 30– to 50-year-old men > women.
Plain radiographs may be normal. Low threshold to obtain MRI in those with risk fact...
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<bold>FIG. 6.44.</bold> Magnetic resonance imaging appearance of avascular necrosis. A: Transverse T<sub>1</sub>-weighted image of a patient (supine) with hip pain on long-term steroid therapy for lupus erythematosus shows nonspecific marrow edema (<italic>arrow</bold>) in the left femoral head (<italic>f</bold>). The location and clinical context of this finding are suggestive of avascular necrosis, but the imaging appearance is otherwise nonspecific. <italic>a</bold>, acetabulum; <italic>b</bold>, bladder. Sagittal T<sub>1</s...
<bold>FIG. 6.44.</bold> Magnetic resonance imaging appearance of avascular necrosis. A: Transverse T<sub>1</sub>-we...