半环槽式外固定器稳定性的动物实验观察

An experimental study on the stability of half-ring sulcated external fixator in goats

本实验用小号半环槽式外固定器治疗青山羊人工胫骨干骨折及胫骨上干骺端截骨延长术,术后动物自由行走、跑跳,观察此外固定条件下不同加压量及不同延长速度和幅度对骨折及骨延长固定稳定性的影响。经X线摄片,力学强度测试及组织学检查,结果表明骨折组对线对位良好,术后6周骨折达骨性愈合,外骨痂呈扁平梭形;骨愈合强度接近正常骨;组织切片见骨小梁连续,且与骨干平行。延长组平均延长71mm,延长率达45.1％,延长区骨生长良好,干骺端无移位、倾斜及翻转。充分证明:半环槽式外固定器具有良好的稳定性,能满足临床治疗骨折及肢体延长术的需要。

In order to investingate the stability of the half-ring sulcated external fixator,it was used to fix the bone after artificial fracture of the tibia shaft and tibia lengthening with proximal metaphyseal osteotomy were performed on 20 and 22 goats respectively.After operation,the animals were allowed to roam about freely,walking or jumping.In the fracture group,radigraphy of the tibia shaft,strength determination of the limb,and histological study of the fractured site were performed at the end of the 6th week.And in the lengthening group,x-ray examination and histological study were done after the 10th week.All the findings indicate that the external fixator designed in our department is well qualified to meet the requirement for the fixation of fractrued bones and the lengthened bones as well.