外固定器一期骨延长治疗火器伤骨折骨缺损的局部微循环变化

观察外固定器一期骨延长治疗火器伤骨折骨缺损的局部微循环变化。16只杂种犬，随机分2组。建立高速火器伤骨折缺损动物模型后，分别采用“外固定器一期骨延长”和传统的“早期石膏固定”两种方法治疗，在不同时间点对两组动物伤肢局部进行微循环测量。结果显示：（1）与普通开放性骨折不同，火器伤骨折局部血流量在3天内持续下降，以后逐步回升，至伤后6周恢复至接近正常的水平；（2）外固定器骨延长组和石膏组相比，骨折局部血流量恢复无明显差异。提示外固定器一期骨延长治疗火器伤骨折骨缺损对骨折局部血流量的恢复无不良影响。

TREATMENT OF THE LOCAL MICROCIRCULATION CHANGES IN PRIMARY BONE LENGTHENING FOR GUNSHOT BONE DEFECT BY EXTERNAL FIXATOR

To observe the local microcirculation changes in primary bone lengthening for gunshot bone defect treated by external fixators, the experimental study was carried out by using canine model of gunshot bone defect of extremities. 16 mongrel dogs were randomly divided into 2 groups, external fixators were used to distract early callus in one group and plaster was used for immobilization in the other group. The local microcirculation in the two groups was measured. The results showed: (1) Different from the normal fractures, the local blood flow of gunshot fractures was reduced in the first 3 days and then increased, at the 6th week it was close to the normal level. (2) There was no significant difference in the restoration of blood flow between the groups of external fixation and plaster immobilization. It is suggested that primary bone lengthening for gunshot bone defect by external fixators has no adverse effect on the restoration of the local blood flow.