Zhang Wei, Hao Ming, Chang Zuhao, Wu Yan, Tang Peifu, Chen Hua
Department of Orthopaedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, PR China.
Department of Orthopaedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, PR China.
Med Eng Phys. 2020 Sep;83:106-111. doi: 10.1016/j.medengphy.2020.05.013. Epub 2020 May 19.
The purpose of this study was to explore the advantages and disadvantages of a multi-dimensional cross locking plate (MDC-LP) compared with a locking compression plate (LCP) as the augmentation plate (AP) over an intramedullary nail (IMN) for the treatment of femoral shaft nonunion by using finite element analysis. A finite element model of the femur was developed to analyze the maximum stress, stress distribution, displacement of fixation and nonunion site under increasing axial and torsional loads. Some differences in the stress distribution and stress values on the fixations were observed in the five fixation models. The MDC-LP with eight screw fixation showed the lowest variety of nonunion site displacement under the increasing axial and torsional loads. Models of the MDC-LP were more stable with regard to the bending and torsional forces. The short MDC-LP with eight screw insertion as an augmentation plate over intramedullary nail shows biomechanical advantages compared to the LCP. The MDC-LP may be an appropriate and effective treatment option for femoral shaft nonunion.
本研究的目的是通过有限元分析，探讨与锁定加压钢板（LCP）相比，多维度交叉锁定钢板（MDC-LP）作为髓内钉（IMN）上的增强钢板（AP）治疗股骨干骨不连的优缺点。建立了股骨的有限元模型，以分析在增加轴向和扭转载荷下的最大应力、应力分布、固定和骨不连部位的位移。在五个固定模型中观察到固定装置上应力分布和应力值的一些差异。在增加轴向和扭转载荷下，采用八枚螺钉固定的MDC-LP显示骨不连部位位移变化最小。MDC-LP模型在弯曲和扭转力方面更稳定。与LCP相比，短的八枚螺钉插入的MDC-LP作为髓内钉上的增强钢板显示出生物力学优势。MDC-LP可能是治疗股骨干骨不连的一种合适且有效的治疗选择。
