EFFECT OF INTERNAL-FIXATION PLATES ON MICROCIRCULATION IN UNDER-PLATECORTICAL BONES - MICROANGIOGRAPHY AND SCANNING ELECTRON-MICROSCOPY

To elucidate the effect of the internal fixation plates on Me local bo ne blood supply, we used microarigiography and scanning electron micro scopy to observe the morphological changes of microcirculation in the cortical bones obtained from intact rabbit tibiae on which plates of t wo different stiffness had been fixed for comparison, The results indi cated that both rigid stainless steel plate and less rigid methyl meth acrylate plate could induce the bone microcirculation under the plate to undergo a process from early depression to late reactive recruitmen t, The features of the microcirculation recruitment such as vascular n umber, arrangement and dilatation varied with plates of different stif fness and were more obvious in the cortex fixed by rigid stainless ste el plate.