Abstract
Large bone defects resulting from trauma, tumors, osteitis, implant loosening, or corrective osteotomies require surgical therapy because spontaneous regeneration is limited to relatively small defects. Currently, transplantation of autografts or allografts, mineral bone substitutes, and callus distraction are the most commonly used techniques for skeletal reconstruction. Each method has significant limitations, e.g., availability and biological or biomechanical reasons. This study was designed to evaluate allograft and new xenograft (bovine fetal growth plate) effects on the bone healing process. Twenty male New Zealand White rabbits were used in this study. In the allograft group, the defect was filled by fresh allogeneic cortical graft; in the xenograft group, the defect was filled by a segment of bovine fetal growth plate and was fixed by cerclage wire. Radiological, histopathological, and biomechanical evaluations were performed and results were scored and analyzed statistically. Statistical tests did not support significant differences between the two groups radiographically at the 14th postoperative day (P > 0.05). There was a significant difference in bone formation at the 28th, 42nd, and 56th postoperative days. There were significant radiological differences for bone union and remodeling by the 42nd day postoperatively (P < 0.05). The xenograft was superior to the allograft by the 56th postoperative day for radiological bone formation (P < 0.03); histopathological and biomechanical evaluation revealed no significant differences between the two groups. It can be concluded that the superior bone healing process in the xenograft group was due to the presence of some osteoinduction proteins in bovine fetal growth plate.
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Bigham, A.S., Dehghani, S.N., Shafiei, Z. et al. Comparison of novel xenograft (bovine fetal growth plate) and allograft effects on experimental bone defect healing in rabbit. Comp Clin Pathol 18, 345–351 (2009). https://doi.org/10.1007/s00580-009-0819-6
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DOI: https://doi.org/10.1007/s00580-009-0819-6