The correct term is osteopenia, which is a medical term. Of determined by Bone Mineral densitometry exams. Osteopenia is slow from the bones because of age, slightly higher than the normal range. Loss of bone density. It is considered a factor somewhat manageable for the patient, since it can be controlled with diet and medications. Conversely, osteoporosis is the accelerated degradation, which is negative and can have consequences, ease in bone fractures.
ostiopenia is incorrectly written, and should be written as "osteopenia" being its meaning:
Word of Greek origin, from osteou osteon: bone and penia penias: poverty, lack. It is the loss of bone mass in less alarming levels as in osteoporosis. The causes can be manifold: in addition to genetic factors, may be due to disturbances in the power, certain infections, as the HIV, chemotherapy, etc.