The difference between osteopenia and osteoporosis
is that in osteopenia the bone loss is not as severe as in osteoporosis. That means someone with osteopenia is more likely to fracture a bone than someone with a normal bone density but is less likely to fracture a bone than someone with osteoporosis.
Bone is a dynamic, living tissue which is continuously remodeled. As old bone is reabsorbed by osteoclasts, (cells that break bone down), the “old and stressed” bone is replaced with healthy new bone by osteoblasts (new bone cells).