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More men are now living long enough to develop osteoporosis. But few are aware of the risk, and fewer still are screened and treated.

By Paula Span

Ronald Klein was biking around his neighborhood in North Wales, Pa., in 2006 and tried to jump a curb. “But I was going too slow — I didn’t have enough momentum,” he recalled.

As the bike toppled, he thrust out his left arm to break the fall. It didn’t seem like a serious accident, yet “I couldn’t get up.”