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Osteopenia is a condition in which bone mineral density is lower than normal. It is considered by many doctors to be a precursor to osteoporosis. However, not every person diagnosed with osteopenia will develop osteoporosis. More specifically, osteopenia is defined as a bone mineral density T-score between â1.0 and â2.5.
Os tibiale navicular refers to an extra bone found in the foot. An accessory bone is a bone that is not normally found in the average human, but in most cases is not considered abnormal. This condition represents a secondary ossification center (growth center) of the navicular bone.It is present from birth.The navicular bone is found on the inside part of the foot.ccessory navicular syndrome as it is called can result from a number of causes: 1  excess or overuse syndrome as seen in an athlete. 2  trauma to the foot as in an ankle sprain or direct trauma to the navicular bone. 3  chronic irritation from shoes rubbing against the extra bone, over time, may cause pain.