Basirom Izzawati, Daud Ruslizam, Ijaz Muhammad Farzik, Rojan Mohd Afendi, Basaruddin Khairul Salleh
Fracture and Damage Mechanics (FDM), Faculty of Mechanical Engineering Technology, University Malaysia Perlis, Arau 02600, Perlis, Malaysia.
Mechanical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
Materials (Basel). 2023 Aug 30;16(17):5958. doi: 10.3390/ma16175958.
An understanding of the biomechanical characteristics and configuration of flexible and locked plating in order to provide balance stability and flexibility of implant fixation will help to construct and promote fast bone healing. The relationship between applied loading and implantation configuration for best bone healing is still under debate. This study aims to investigate the relationship between implant strength, working length, and interfragmentary strain (εIFM) on implant stability for femoral midshaft transverse fractures. The transverse fracture was fixed with a fragment locking compression plate (LCP) system. Finite element analysis was performed and subsequently characterised based on compression loading (600 N up to 900 N) and screw designs (conventional and locking) with different penetration depths (unicortical and bicortical). Strain theory was used to evaluate the stability of the model. The correlation of screw configuration with screw type shows a unicortical depth for both types ( < 0.01) for 700 N and 800 N loads and < 0.05) for configurations 134 and 124. Interfragmentary strain affected only the 600 N load ( < 0.01) for the bicortical conventional type (group BC), and the screw configurations that were influenced were 1234 and 123 ( < 0.05). The low steepness of the slope indicates the least εIFM for the corresponding biomechanical characteristic in good-quality stability. A strain value of ≤2% promotes callus formation and is classified as absolute stability, which is the minimum required value for the induction of callus and the maximum value that allows bony bridging. The outcomes have provided the correlation of screw configuration in femoral midshaft transverse fracture implantation which is important to promote essential primary stability.
了解柔性锁定钢板的生物力学特性和结构，以实现植入物固定的平衡稳定性和灵活性，将有助于促进快速骨愈合。关于为实现最佳骨愈合而施加的负荷与植入结构之间的关系仍存在争议。本研究旨在探讨股骨中轴横形骨折植入物强度、工作长度和骨折块间应变（εIFM）与植入物稳定性之间的关系。采用骨折块锁定加压钢板（LCP）系统固定横形骨折。进行有限元分析，随后根据不同穿透深度（单皮质和双皮质）的加压负荷（600 N至900 N）和螺钉设计（传统型和锁定型）对其进行表征。采用应变理论评估模型的稳定性。螺钉结构与螺钉类型的相关性显示，对于700 N和800 N负荷，两种类型的单皮质深度（<0.01），对于结构134和124，相关性为<0.05。骨折块间应变仅影响双皮质传统型（BC组）的600 N负荷（<0.01），受影响的螺钉结构为l234和123（<0.05）。斜率的低陡度表明在高质量稳定性下，相应生物力学特性的εIFM最小。应变值≤2%可促进骨痂形成，被归类为绝对稳定性，这是诱导骨痂所需的最小值和允许骨桥接的最大值。研究结果提供了股骨中轴横形骨折植入物中螺钉结构的相关性，这对于促进基本的初始稳定性很重要。
