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Morphometrics of compact bone: an example from Sudanese Nubia.

Morphometric analysis of compact femoral tissue was applied to a prehistoric population from Sudanese Nubia. Microradiographs of thin sections from below the lesser trochanter were examined. A total of 74 adults (40 females, 34 males) from the X-Group population (A.D. 350-550) were used to determine the underlying processes of bone remodeling in skeletal growth and maintenance. The relationship of bone turnover to the age of onset, patterning and frequency of cortical bone loss (osteoporosis) as a function of age and sex was examined. The cortical thickness, cortical area and formation/resorption frequencies were determined. Males exhibit a 4. 9per thousand net loss in cortical area, while females show a 10. 7per thousand loss. A substantial amount of female loss occurs in the third decade, with slight gain in the fourth and a steady loss up to the sixth decade. These trends were further explored and refined histologically. The periosteal and endosteal frequencies for males show a variable but definite decrease in mineralization (i.e., increased numbers of osteons in the forming stage) and a slight increase in resorption. Third decade females show a marked difference with high frequencies of resorption spaces and forming osteons. It is suggested that in this population, stress related to childbearing and childrearing may be effecting the frequencies of formation foci and resorption spaces.