Abstract
Reaction of cortical bone and trabecular bone to implants were studied in sheep tibiae with experimental osteotomy plated by stainless steel and carbon — epoxy resin plates and in human femoral heads with inserted screws after femoral neck fracture. Monitoring of two new features — the osteocyte viability count and defective bone mineralisation allowed to detect not previously recognised, yet widespread degeneration and necrosis of bone cells accompanied by tinctorial and structural defects in the tissue. This generalised “distress” reaction generates the extensive resorption-reparative process which initiates the bone tissue rebuilding around the implants. Two simple methods for assessment of the Osteocyte viability count and for demonstration of the osteoid and Mineralisation defects in the ordinary decalcified paraffin sections are described. With these tools more new features, common in the remodelling bone tissue, were identified: bone tissue defect, repair bone malacia with splits, laminated bone and recurrent bone necrosis and repair.
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