How to manage Osteoporosis before the age of 50

What is the definition of osteoporosis before the age of 50?

Do WHO criteria apply to osteoporosis before age 50?

Do the WHO criteria used to define postmenopausal women work in this group as well?

Is there a link between Low BMD and fracture risk in this group?

How significant is the serial BMD in evaluating this group?

What are the types of osteoporosis under the age of 50?

What are the diagnostic and therapeutic measures in this age group?