Criteria for choosing the optimal parameters of animal model of lumbar intertransverse fusion in rabbits
DOI:
https://doi.org/10.26641/1997-9665.2017.4.40-47Keywords:
Lumbar intertransverse fusion, bone graft, rabbit, animal model, meta-analisisAbstract
Background. The reported fusion rates for autograft in the rabbit posterolateral spine model have varied significantly, and the potential factors that might affect these rates have not been sufficiently evaluated. Objective. To identify factors affecting the fusion rates in the rabbit lumbar intertransverse arthrodesis model by the meta-analysis results. Methods. Meta-analysis a MEDLINE search from 2002-20016 was performed for publications that utilized this model to evaluate fusion rates elicited by iliac crest autograft. We detected the effect of the following experimental conditions on the fusion rates: 1) parameters of the animals population: sex, age and weight of rabbits; 2) the experiment design: the level of the operated vertebral segments, the volume of the autograft, the time-point of the experiment, the timing of the evaluation of the results of fusion, methods for assessing the fusion rates (palpation, radiography, computed tomography, histological studies). Results. A systematic literature search identified 25 studies, involving 432 animals. The rabbit average age reached 10.4 ± 2.7 (3.8 - 16.0) months; the average weight was 4.1 ± 0.7 (2.4 - 5.0) kg; the volume of bone autograft averaged 4.2 ± 2.0 (0.8 - 10.0) cm3. Neither strain, age, weight, nor vertebral level significantly affected fusion rates. Conclusion. The optimal experimental conditions for a successful outcome, according to the present study, include: the weight of the rabbit more than 3 kg, the level of spinal fusion LIV - LV or LV - LVI, the volume of the bone autograft - 2.0 - 2.5 cm3 on each side of the fusion segment, the experiment time-point not less than 5 weeks.
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