一种新型可变应力骨折内固定钢板的实验研究

目的为克服目前临床上应用的骨折内固定钢板的应力遮挡效应，设计一种新型可变应力的骨折内固定钢板，通过动物实验比较新型钢板和普通型钢板对骨折愈合的影响。方法６０只家兔随机分为实验组和对照组，两组均造成右侧胫骨骨折，实验组用新型钢板行内固定手术，对照组用普通型钢板内固定手术。结果对照组骨皮质变簿及骨髓腔变大较实验组明显；组织学发现，实验组骨痂出现早，骨质吸收少、骨折局部改建快。结论新型骨折内固定钢板设计合理，可以减少钢板对骨的应力遮挡效应，性能优于目前临床上应用的普通钢板。

Experimental study on a new variable stress steel plate for internal fixation of fracture

Objective in order to overcome thestress-shielding effect (SPE) caused by thecommon straight plate we designed a new platecalled variable stress plate. The purpose of thepresent study was to compare the effect betweentwo types of plates on internal fixation of fractureby means of animal experiment.Methods sixty rabbits were divided into testgroup and control group and made fracture modleon the right tibia in all rabbits. The experimentalanimals were fixed with the present steel plate,while control ones with the common straight plate.Results It was more obvious that the cotex ofbone became thinner and the marrow cavity became larger in control group than in test group.Itwas found histologically that callus occuredearler, substance of bone absorption was less,and fractured bone reconstructed faster in the testgroup than in the other one.Conclusion It is suggested that the design ofthe new steel plate is reasonable and can decreasethe stress-shielding effect of the plate on the bone.Thus its property is superior to the commonstraight plate.