DEAR DR. ROACH: My husband and I are confused about the guidelines concerning when older men should be screened for osteoporosis. All the information seems to suggest that it is only needed for men over 70 who have had a fracture. In my husband’s case, he was only told to get a DEXA (dual-energy X-ray absorptiometry) scan after he had back pain and several compression fractures of the thoracic spi…