颈椎前路椎间撑开的实验研究

目的：研究撑开器撑开高度与撑开力的关系，探讨用撑开扭力的变化值来判断颈椎前路手术合适椎间撑开高度方法的可行性。方法：新鲜尸体颈椎标本6具，用带扭力显示的撑开器测定椎间撑开高度与撑开扭力变化，对结果进行统计分析和比较。结果：撑开扭力随撑开器撑开先平稳增加然后显著增加，依次切断不同结构后，撑开扭力值降低但变化相似，黄韧带切断后则不再表现扭力显著增加。结论：颈椎前路手术彻底减压后，撑开扭力显著增加为黄韧带紧张产生的阻力所致，根据扭力显著变化来确定合适的撑开高度的方法是可行的。

Experimental research of anterior cervical intervertebral distracting

Objective:Study the relation of distracting force and distracted intervertebral height.To testify the method of judging the appropriate distracting height by the distracting force during anterior cervical surgical approach.Method:6fresh cadavertic cervical specimens were measured of its resistant force to distracting by using torsion displayable retractor.Analysis and compare the results.Result:The distracting torsion increased smoothly at first and dramatically when intervertebral space was entirely distracted.Cutting the different ante-rior structure only reduce the torsion value but could not change its variation pattern,except cutting the yellow ligament which showed no more increase in torsion.Conclusion:After anterior cervical decompression was com-pleted,the marked increased distracting torsion was due to the strain of the yellow ligaments.It is feasible to judge the proper intervertebral height by distracting torsion variation.