骶髂关节骨折脱位不同内固定方式的生物力学研究

Biomechanical study no different internal fixations for sacroiliac joint

目的比较骶髂关节行三种不同内固定后对其生物力学稳定性的影响。方法取成年男性防腐标本12具,随机分为4组,每组3个标本。正常完整的骨盆标本为对照组,骶髂关节使用重建钢板内固定组(SP组),骶髂关节使用骶髂螺钉内固定(SS组),骶髂关节使用COLORADO 2TM内固定(COL组)。用实验应力的方法测试各组的生物力学稳定性。结果(1)COLORADO 2TM应变最小;(2)负载500 N,COLORADO 2TM位移最小;(3)强度测定:COL组与对照组相差14%(P>0.05),SS组和SP组与对照组相差分别为16%和21%(P<0.05);(4)轴向刚度和弯曲刚度比较:COL组高于SS组4%、5%和SP组8%、10%;(5)骨盆的极限力学性能测试:COL组的承载能力比SS组高17%,比SP组高23%。结论COLORADO 2TM、骶髂螺钉和重建钢板三种不同的内固定可以维持骨折脱位后骶髂关节的稳定,以COLORADO2TM固定最为坚固。

Objective To compare the stability of three kinds of fixations for the sacroiliac joint. Methods Twelve embalmed pelvis samples were randomly divided into 4 groups of N, SP, SS and COLORADO 2TM. Nondestructive biomechanical tests were performed in axis compression on each group. Results COLORADO 2TM strain was the smallest. When loaded with 500 N, COLORADO 2TM showed the smallest displacement. The strength of COLORADO 2TM decreased by 14% compared with that of N,by 16% compared with that of SS,and by 21% compared with that of SP （P〈0. 05）. The axial stiffness and bend stiffness of COLORADO 2TM increased by 4% and 5% compared with those of SS and by 8% and 10% compared with those of SP. The pelvis extreme mechanical function of COLORADO 2TM increased by 17% compared with that of SS and by 23% compared with that of SP. Conclusion COLORADO 2TM, SS and SP could maintain the stability of the impaired sacroiliac joint, among which COLORADO 2TM is the strongest.