RESUMO
Objective The research of craniocerebral injury and fracture healing has made slow progress, and the lack of reliable animal experimental model is one of the key factors.Therefore, the focus is to establish a craniocerebral injury and fracture model up to standard.The study aims to establish an appropriate animal model and evaluate the stability.Methods New Zealand white rabbits were randomly divided into four groups(n=12): control group, simple craniocerebral injury group(simple craniocerebral injury model), simple fracture group(simple right tibial fracture model), Brain trauma with fracture group (craniocerebral injury combined with fracture model).The neurological changes of the rabbits were observed.Furthermore, the healing of the fractures was observed at different time postoperatively by measuring the volume of callus and observing pathology.Results The neurological function scale (NSS) scores [(9.32±0.68), (8.01±0.56), (7.75±0)]6 h, 7 d and 1 month after craniocerebral injury surgery were significantly lower than those in the control group[(11.81±0.55),(12.07±0.42),(12.02±0.38)], and there was statistically significant difference (P<0.05).Compared with the callus volume of simple fracture group around 1 month after surgery, the callus volume of the craniocerebral injury combined with fracture group was significantly larger [(1.19±0.12) cm3 vs (1.81±0.13) cm3, P<0.05].Four weeks after surgery in the craniocerebral injury combined with fracture group, the trabecular bone was significantly increased in the local callus.After 8 weeks, the trabecular bone became more mature.Conclusion The animal model of craniocerebral injury combined with fracture healing is stable and reproducible.It meets the standard for studying the relationship of traumatic brain injury and fracture.