School of Health Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, China.
Academy for Engineering and Technology, Fudan University, 220 Handan Road Shanghai, 200433, China.
Med Eng Phys. 2024 Sep;131:104222. doi: 10.1016/j.medengphy.2024.104222. Epub 2024 Aug 5.
To explore the biomechanical effects of different internal fixation methods on femoral neck fractures under various postoperative conditions, mechanical analyses were conducted, including static and dynamic assessments. Ultimately, a mechanical stability evaluation system was established to determine the weights of each mechanical index and the evaluation scores for each sample. In static analysis, it was found that the mechanical stability of each model met the fixation requirements post-fracture. During the healing process, the maximum stress on the hollow nail slightly increased, and stress distribution shifted from multi-point to a more uniform single-point distribution, which contributes to fracture healing and reduces the risk of stress concentration. In dynamic analysis, resonance points frequently occurred at low frequencies. With increasing walking speed, the maximum stress increased significantly. At slow speeds, the maximum stress approached the material's yield limit. Under cyclic dynamic loading, the number of cycles barely met the requirements of the healing period, and increasing walking speed may lead to fatigue fractures. The evaluation model established in this study comprehensively considers different mechanical performances in static and dynamic analyses. Based on various mechanical analyses and evaluation systems, the applicability of internal fixation treatment plans can be assessed from multiple dimensions, providing the optimal simulated mechanical solution for each case of femoral neck fracture treatment.
为了探讨不同内固定方法在各种术后条件下对股骨颈骨折的生物力学影响，进行了力学分析，包括静态和动态评估。最终建立了一个机械稳定性评估系统，以确定每个力学指标的权重和每个样本的评估得分。在静态分析中，发现每个模型的机械稳定性都符合骨折后的固定要求。在愈合过程中，空心钉上的最大应力略有增加，并且应力分布从多点分布转移到更均匀的单点分布，这有助于骨折愈合并降低应力集中的风险。在动态分析中，在低频处经常出现共振点。随着步行速度的增加，最大应力显著增加。在低速时，最大应力接近材料的屈服极限。在循环动态加载下，循环次数几乎满足愈合期的要求，增加步行速度可能导致疲劳骨折。本研究建立的评估模型综合考虑了静态和动态分析中的不同力学性能。基于各种力学分析和评估系统，可以从多个维度评估内固定治疗方案的适用性，为每个股骨颈骨折治疗病例提供最佳的模拟力学解决方案。
