What is the prevalence of osteonecrosis?

• A. 0.1%
• B. 1%
• C. 5%
• D. 10%

Answer: (A)

Osteonecrosis of the jaw is a very rare condition in the general population, so its prevalence is low. Prevalence measures how common the condition is in a group at a given time, and for jaw osteonecrosis the overall rate in people not exposed to high-risk therapies is about 0.1% (roughly one in a thousand). This is why the 0.1% figure is the best estimate among the options.

In contrast, the prevalence rises in specific high-risk groups—such as cancer patients receiving intravenous bisphosphonates or those who have undergone radiation therapy to the jaws—but those scenarios represent special populations, not the general prevalence. The larger percentages (1%, 5%, 10%) would imply a much more common condition than is typically observed outside of those high-risk contexts.