The best replacement for osteonecrosis is avascular necrosis.

The best alternatives to osteonecrosis are rated as following:
★★★★★  avascular necrosis
★★  osteomyelitis
★★  osteoporosis
★  osteoarthritis
★  osteochondrosis
  ischemic necrosis

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Speaking about osteonecrosis, one probably shouldn't forget about zometa.

Other search terms related to osteonecrosis and their ratings are:
★★★★★ zometa
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osteonecrosis
avascular necrosis
osteomyelitis