Chen Jun-Xin, Li Yun-He, Wen Jian, Li Zhen, Yu Bin-Sheng, Huang Yong-Can
Shenzhen Key Laboratory of Spine Surgery, Department of Spine Surgery, 74573Peking University Shenzhen Hospital, Shenzhen, China.
Shenzhen Engineering Laboratory of Orthopaedic Regenerative Technologies, National & Local Joint Engineering Research Center of Orthopaedic Biomaterials, 74573Peking University Shenzhen Hospital, Shenzhen, China.
Global Spine J. 2023 Apr;13(3):724-729. doi: 10.1177/21925682211006061. Epub 2021 Mar 30.
A biomechanical study.
The purpose of this study was to investigate the effects of cruciform and square incisions of annulus fibrosus (AF) on the mechanical stability of bovine intervertebral disc (IVD) in multiple degrees of freedom.
Eight bovine caudal IVD motion segments (bone-disc-bone) were obtained from the local abattoir. Cruciform and square incisions were made at the right side of the specimen's annulus using a surgical scalpel. Biomechanical testing of three-dimensional 6 degrees of freedom was then performed on the bovine caudal motion segments using the mechanical testing and simulation (MTS) machine. Force, displacement, torque and angle were recorded synchronously by the MTS system. value <.05 was considered statistically significant.
Cruciform and square incisions of the AF reduced both axial compressive and torsional stiffness of the IVD and were significantly lower than those of the intact specimens ( < .01). Left-side axial torsional stiffness of the cruciform incision was significantly higher than a square incision ( < .01). Neither incision methods impacted flexional-extensional stiffness or lateral-bending stiffness.
The cruciform and square incisions of the AF obviously reduced axial compression and axial rotation, but they did not change the flexion-extension and lateral-bending stiffness of the bovine caudal IVD. This mechanical study will be meaningful for the development of new approaches to AF repair and the rehabilitation of the patients after receiving discectomy.
一项生物力学研究。
本研究旨在探讨纤维环（AF）的十字形和方形切口对牛椎间盘（IVD）在多个自由度下力学稳定性的影响。
从当地屠宰场获取八个牛尾椎IVD运动节段（骨-椎间盘-骨）。使用手术刀在标本纤维环右侧制作十字形和方形切口。然后使用机械测试与模拟（MTS）机器对牛尾椎运动节段进行三维6自由度的生物力学测试。MTS系统同步记录力、位移、扭矩和角度。P值<.05被认为具有统计学意义。
AF的十字形和方形切口均降低了IVD的轴向压缩和扭转刚度，且显著低于完整标本（P<.01）。十字形切口的左侧轴向扭转刚度显著高于方形切口（P<.01）。两种切口方法均未影响屈伸刚度或侧屈刚度。
AF的十字形和方形切口明显降低了轴向压缩和轴向旋转，但未改变牛尾椎IVD的屈伸和侧屈刚度。这项力学研究对于AF修复新方法的开发以及椎间盘切除术后患者的康复具有重要意义。
