尺骨冠状突骨折合并肘关节后脱位有限元模型的建立与分析

目的：建立尺骨冠状突骨折合并肘关节后脱位的有限元模型，并对肘关节后脱位在关节稳定性方面的影响进行数字化研究。方法：建立正常肘关节-前臂（IEJF）有限元模型与尺骨冠状突骨折肘关节-前臂（FUCF）有限元模型。采用压缩、屈曲两组生理荷载（每组3种幅值），进行计算、验证和应力分析。结果：建立了结构完整的IEJF与FUCF有限元模型，并对模型进行验证，情况与临床实际符合。计算得出FUCF有限元模型较IEJF有限元模型桡骨头出现了严重的应力集中现象，不同压缩荷载作用下的肘关节纵向压缩位移与不同屈曲力矩导致的屈曲角都有所增加。结论：尺骨冠状突骨折及肘关节后脱位对肘关节-前臂纵向不稳有一定程度的影响。本研究所构建的肘关节-前臂有限元模型对尺骨冠状突骨折合并肘关节后脱位的临床稳定性评估研究及手术治疗方案的制定具有一定的参考价值。

Trauma finite element modeling and analysis of ulna coronoid process fracture with posterior dislocation of elbow joint

Objective: To establish the ulna coronary finite element model of the fracture after the combined elbow dislocation and to study the influence of posterior elbow dislocation on joint stability. Methods: The intact elbow joint and forearm (IEJF) finite element model and fractured ulnar coronoid-process and forearm (FUCF) finite element model were established, and two groups of physiological loads with compression and flexion (three amplitudes for each group) were used for the calculation, verification and stress analysis. Results: The IEJF and FUCF finite element models with complete structure were established and verified. The results were consistent with clinical practice. Compared with the IEJF finite element model, the FUCF finite element model presented serious stress concentration in the radial head, and the longitudinal compression displacement of the elbow joint under different compressive force and the flexion angle caused by different flexion bending moments were both increased. Conclusion: The fracture of the coronoid process of the ulna and the posterior dislocation of the elbow might affect the elbow joint and forearm longitudinal instability to some extent. The elbow joint and forearm finite element model constructed in this experiment can be used to evaluate the clinical stability of ulna coronoid process fracture with posterior dislocation of elbow and the formulation of surgical treatment plan.