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The bone resistance largely depends on the bone mineral density. Osteoporosis is a disease in which the bone resistance is affected, and establishing a diagnostic of certainty can be achieved by determining the bone mineral density. The present paper is based on the analysis of the results of the osteodensitometric investigation conducted on 361 patients who had been diagnosed with primary or secondary osteoporosis. The investigation took into account the hip bone and the vertebral column, and the following parameters have been analyzed: bone mineral content, bone mineral density, T-score and Z-score. We analyzed the evolution of the bone mineral density with increasing age, the existence of a connection between the bone mineral density determined at the vertebral column and at the hip, the connection between the T- and Z-score and age at the population we took into account, as well as the existence and the type of discordance in diagnosis for the two points of determination.

We found out that there is a decrease in the bone mineral density above the age of 40; concerning the T-score, there is an obvious decrease tendency with ageing, both at the vertebral column and at the hip, while in the case of the Z-score, the tendency is that of increasing with age. The most frequent discordance in diagnosis found in the population we analyzed is the minor one. The axial skeleton is preponderantly affected.

Keywords: age, bone mineral density, osteoporosis, T-score, Z-score