Experimental substantiation of osteotransplant application in traumatic vertebral defects

Abstract

Objective. To analyze the features of bone tissue formation during plasty of vertebral body defect or fracture with an allogeneic bone graft in an experiment in vitro. Material and Methods. Models of the vertebral body defect (fracture of the cranioventral part with penetration into the nucleus pulposus) were created in an experiment on 20 mini-pigs of the same age. Plasty of traumatic defects was performed with allogeneic bone graft or autologous bone. CT, histological, and spectrometric studies of microscopic specimens were carried out at 14, 30, 90, and 180 day. Reparative osteogenesis, X-ray density, Ca and P content, and microhardness were studied. Results. After implantation of allogeneic bone graft, an organ-specific bone similar to the recipient’s bone in morphological structure, X-ray density, mineral composition and microhardness, was formed on the 90th day (P = 0.01). After transplantation of autobone, the regenerate formed by this day in the central part was in a phase of resorption and restructuring with lower indices of X-ray density, content of Ca and P, and microhardness (P = 0.01). Conclusion. Аfter plasty of vertebral body traumatic defects with allogeneic bone graft, the organ-specific bone tissue is formed at an earlier time and reliably exhibits greater mineralization and strength.