Plain films are insensitive since they require up to 50% bone loss before they are positive. The correct examination is the DEXA evaluation, which provides a much more sensitive determination of bone mass and can be utilized to track response to treatment. Note that up to about 70% of women and 20% of all men will eventually have significant osteoporosis. Predisposing factors include use of steroids, DM, oophorectomy, alcohol, and malnutrition. MRI and NM examinations are not indicated.