RED CELL VOLUMES AND VASCULAR PATTERNS IN LONG BONES

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Abstract
The vascular patterns in long bones demonstrable by microradiography, are illustrated in the femur and tibia of young rats. From this a brief description of the osseous circulation as a whole is derived. Some hemodynamic aspects of the osseous circulation are reviewed, and a method of estimating a hitherto unknown one, the circulating red cell volume is presented. A radiolsotope dilution technique was employed, red cells being labelled with Cr51. The absolute and relative quantities of red cells in superior metaphysis, inferior metaphysis, cortex, inferior epiphysis and bone marrow samples were obtained. The results indicate marked differences in bone turnover rates in different bone tissues taken from the same bone.