国人腘绳肌腱移植不同固定方式重建ACL的生物力学研究

[目的]探讨腘绳肌腱移植重建ACL股骨与胫骨侧采用不同固定方式的生物力学特性。[方法]采用新鲜冷冻尸体膝关节标本,腘绳肌腱移植,股骨侧分别用Endobutton(n=8)、Rigidfix(n=8)、肌腱结(n=8)和界面螺钉固定(n=8)。胫骨端采用可吸收界面螺钉(n=7)和Intrafix(n=7)固定,模拟ACL重建。进行循环载后位移、抗拉刚度、失效载荷、最大载荷等生物力学。[结果]失效载荷和最大载荷:EndobuttonRigidfix肌腱结界面螺钉固定法,差异有统计学意义(P0.01),Rigidfix和界面螺钉之间的差异有统计学意义(P0.05)。抗拉刚度:Rigidfix=肌腱结界面螺钉固定Endobutton。循环载荷位移:肌腱结固定组Rigidfix固定组Endobutton固定组界面螺钉固定组。胫骨端最大载荷:Intrafix固定组可吸收界面螺钉组,两者之间差异有统计学意义(P0.05);100 N、400 N抗拉刚度两组间差异无统计学意义(P0.05)。[结论]采用Endobutton、Rigidfix、intrafix、肌腱结和界面螺钉ACL重建固定均可满足力学需求;Rigidfix和Intrafix固定系统较界面螺钉固定更具有生物力学优势。

Biomechanical study of different internal fixations with Chinese hamstring tendon in anterior cruciate ligament reconstruction

[Objective]To analyze the biomechanics of different internal fixations with Chinese hamstring tendon in anterior cruciate ligament(ACL) reconstruction.[Method]Reconstruction models of ACL were established in human cadaver knee joint and randomly divided into different groups according to different materials: Endobutton(n=8),Rigidfix(n=8),Hamstring tendon knot(n=8),Interface absorbable screw(n=8) in femoral side.Interface absorbable screw(n=7) and Intrafix(n=7) in tibial side.The stiffness,max loading,failur...