Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, 40002, Thailand.
Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, 40002, Thailand.
Clin Biomech (Bristol). 2020 Dec;80:105156. doi: 10.1016/j.clinbiomech.2020.105156. Epub 2020 Aug 24.
Allografts and recycled bone autograft are commonly used for biological reconstruction. The dual locking plates fixation method has been advocated for increasing allograft stability and preventing fixation failure; however, the biomechanical properties of the various configurations of dual locking plates have not been extensively studied.
In a finite element (FE) analysis, we developed 6 patterns of different dual locking plate configurations for fixation of the mid shaft of the femur. The maximum strains were recorded for each of the 6 models then axial, bending and torsion stiffness were calculated. The FE analysis was validated the results with mechanical testing (axial compression, bending, and torsional stiffness) on a cadaveric femur.
The highest axial compression (715.41 N/mm) and lateral bending (2981.24 N/mm) was found in Model 4 (with two 10-hole locking plates placed at the medial and lateral side), while the highest torsional stiffness (193.59 N·mm /mm) was found in Model 3 (with 8- and 10-hole locking plates placed at the posterior and lateral side). Excellent agreement was found between the finite element analysis and biomechanical testing (r = 0.98).
The dual locking plate configuration with medial and lateral, 10-hole locking plates provided the most rigid and strongest fixation of the femur; both in terms of axial compression and lateral bending stiffness.
同种异体移植物和回收的自体骨移植物常用于生物重建。双锁定钢板固定方法已被提倡用于增加移植物的稳定性和防止固定失败；然而，各种双锁定钢板配置的生物力学特性尚未得到广泛研究。
在有限元（FE）分析中，我们为股骨中段的固定开发了 6 种不同的双锁定钢板配置模式。记录了 6 种模型中的每种模型的最大应变，然后计算了轴向、弯曲和扭转刚度。FE 分析通过对尸体股骨进行机械测试（轴向压缩、弯曲和扭转刚度）进行验证。
模型 4（在内外侧放置两块 10 孔锁定钢板）的轴向压缩（715.41 N/mm）和侧向弯曲（2981.24 N/mm）最高，而模型 3（在后侧和外侧放置 8 孔和 10 孔锁定钢板）的扭转刚度（193.59 N·mm/mm）最高。有限元分析和生物力学测试之间存在极好的一致性（r=0.98）。
内外侧的双锁定钢板配置，10 孔锁定钢板为股骨提供了最刚性和最强的固定；无论是在轴向压缩和侧向弯曲刚度方面。
