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目的:应用三维有限元技术评估发育性髋关节脱位(developmental dysplasia of the hip,DDH)患儿在Dega骨盆截骨术后不同中心边缘角(center-edge angle,CEA)状态下髋臼的应力分布,为术前的手术规划提供有参考价值的生物力学结果。方法:使用已建立的DDH患者髋关节三维有限元模型,以术后CEA27°为中间值,每3°为一个变量,在Mimics誖10.0软件的模拟手术模块分别构建7组髋臼截骨术后的模型。在单腿站立和双腿站立状态下测量不同CEA状态下髋臼的应力分布。结果:单腿站立情况下,CEA为24°、27°、30°和33°的术后模型患侧髋臼的峰值应力接近正常侧。双腿站立情况下,CEA为24°时双侧髋臼的峰值应力最为接近。结论:对于该患者而言,在7组术后CEA中,24°时患侧髋臼的峰值应力与健侧最为接近,可以认为是最佳的术后CEA。有限元技术能够为Dega手术的术前规划提供个性化的指导方案。
OBJECTIVE: To evaluate the stress distribution of acetabular under different center-edge angle (CEA) conditions in children with developmental dysplasia of the hip (DDH) after three-dimensional finite element analysis , Provide valuable biomechanical results for preoperative surgical planning. Methods: Three-dimensional finite element model of hip joint was established in DDH patients. The postoperative CEA 27 ° was taken as an intermediate value and every 3 ° as a variable. Seven groups of acetabular osteotomy were constructed in simulated operation module of Mimics Paradox 10.0. Model. The stress distribution of the acetabulum under different CEA conditions was measured under standing and standing legs. Results: The peak stress of the affected acetabulum was close to the normal side in the postoperative model with CEA of 24 °, 27 °, 30 ° and 33 °. With both legs standing, the peak stress of the bilateral acetabulum was closest when CEA was 24 °. CONCLUSIONS: For this patient, the peak stress at 24 ° in the affected side of acetabulum at 24 ° is the closest to that of the contralateral CEA, which is considered to be the best postoperative CEA. Finite element technology can provide a personalized guideline for the preoperative planning of Dega surgery.