Background

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.

Methods

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.

Findings

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 (r² = 0.98).

Interpretation

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.

中文翻译：

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股骨同种异体或再生自体骨固定的双锁定板的最佳配置：有限元和生物力学分析。

背景

同种异体移植和再生骨自体移植通常用于生物重建。提倡双锁定板固定方法可提高同种异体移植物的稳定性并防止固定失败。然而，双锁定板的各种构造的生物力学特性尚未得到广泛研究。

方法

在有限元（FE）分析中，我们开发了6种不同的双重锁定板配置模式，用于固定股骨中轴。记录6个模型中每个模型的最大应变，然后计算轴向，弯曲和扭转刚度。FE分析通过尸体股骨的机械测试（轴向压缩，弯曲和扭转刚度）验证了结果。

发现

在模型4中（在内侧和外侧放置两个10孔锁定板）发现了最高的轴向压缩力（715.41 N / mm）和横向弯曲（2981.24 N / mm），而扭转刚度最高（193.59 N·在模型3中发现了mm / mm）（8孔和10孔锁定板位于后侧面和侧面）。在有限元分析和生物力学测试之间发现了极好的一致性（r ²  = 0.98）。

解释

带有内侧和外侧10孔锁定板的双锁定板配置提供了最坚固，最牢固的股骨固定。在轴向压缩和横向弯曲刚度方面。