<unk>  is classified based on etiology and severity of the disease.<unk>  may be divided into primary and secondary types, based on disease etiology. On the basis of disease severity, it can be classified as osteopenia,<unk> , and severe<unk> .<unk>  is rare in children and adolescents. Secondary<unk>  results from various comorbidities or the use of certain medications, whereas, idiopathic<unk>  has no known cause.
Osteoporosis classification
Hyperparathyroidism classification
Vitamin D deficiency classification
Bone or cartilage mass evaluation
Osteoporosis epidemiology and demographics
Osteoma classification
Osteoarthritis physical examination
Cancer staging