11.   Instead, he found signs that the bone was becoming healthy again.

12.   Minerals are deposited in the bone so abnormally that the bone becomes as hard as ivory in some patients.

13.   Over time, bones can become so brittle and fragile that merely standing up can cause them to break.

14.   The bones also become hard and brittle after death.

15.   The condition, in which the bones become very fragile, generally occurs after menopause when the levels of naturally occurring estrogen drop.

16.   The condition, in which the bones become very fragile, generally occurs after menopause when the levels of naturally-occurring estrogen drop.

17.   The drug holds the promise of sparking a revolution in the largely underdeveloped market for treating osteoporosis, a condition in which the bones become fragile.

18.   Though Carbone was a very fit aerobics instructor at the time, her bones became so weak she would wake up with spontaneous rib fractures.

19.   When the hormone estrogen is switched off, bones become more breakable.

20.   With less mass, bones become weaker and more likely to break.