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INVESTIGATION OF THE GROWTH AND STRUCTURE OF THE TIBIA OF THE RABBIT BY MICRORADIOGRAPHIC AND AUTORADIOGRAPHIC TECHNIQUES



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Abstract

1. The detailed anatomy and calcification of the upper half of the tibia in rabbits varying in age from six weeks to twelve months has been studied.

2. The structure of the bone varies at different levels, but a section taken from the same level in the tibia from animals of the same age presents a reasonably constant picture.

3. It has been shown that this variation in structure at different levels is directly related to a difference between the axis of growth and the bone axis. This difference is a result of the unique shape of the tibia.

4. Autoradiographic studies confirm the localised concentration of radioactive strontium in areas of active bone formation where uptake is rapid.

5. The long retention of radioactive strontium in the skeleton (that is, the slow turnover) is a result of the slowness of resorption of bone (endosteal, periosteal or Haversian) in the cortex. Not only is the process slow but it is extremely localised.

6. The significance of these anatomical and physiological characteristics in relation to radiation injury is discussed.

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