BACKGROUND: Acetabular bone defects in hip arthroplasty are often difficult to locate and quantify, and therefore the use of computer-aided design and computer-aided processing technology for preoperative preparation can reduce the difficulty and risk of acetabular reconstruction.OBJECTIVE: To investigate the application and significance of Mimics software for individual revision of total hip prothesis.METHODS: The hip CT scan image data of patients with total hip arthroplasty was input into Mimics software to reconstruct the three-dimensional hip joint model. The anteversion, valgus angle, neckshaft angle, femoral head diameter, acetabular wall thickness/diameter and loosening broken case of the hip prosthesis were measured; the range of acetabular bone defect was located and quantified. Meanwhile, through the simulation of the renovation, the range of bone and the implanted total hip prosthesis size were designed.RESULTS AND CONCLUSION: Mimics three-dimensional window was used to precisey locate the broken prosthesis; the maximum longitudinal diameter of the debris was forecasted to 33.68 mm, the distance from the debris to the femoral head prosthesis was 48.93 mm, the distance from the debris to the acetabular component was 20.14 mm. The average threshold of acetabular selected 130.47 mm2 viewable area was 339.98, the average threshold of 130.47 mm2 viewable area in bone defect area was -481.25, and the defect area was 21.41 mm×21.38 mm. The bone defects were evaluated according to three-dimensional model assessment and classified: American Academy of Orthopaedic Surgeons classification type ⅠB, Gross classification type ⅡA, Engh classification type Ⅰ. Results confirm that Mimics software can optimize solutions and ways of hip arthroplasty and reduce complications and the risk of surgery.%背景 人工髋关节翻修中髋臼骨质缺损常常是难以定位及定量的,因而利用计算机辅助设计与计算机辅助加工技术进行置换前准备可减少髋臼重建的难度及风险.目的 探讨Mimics 软件在个体化全髋关节假体翻修中的应用及意义.方法 将全髋关节翻修患者髋关节CT 扫描图像数据导入Mimics 软件,重建髋关节三维模型.测量髋关节假体前倾角、外翻角、颈干角、股骨头直径、髋臼壁厚度/直径以及假体松动破碎情况,对髋臼骨质缺损范围进行定位以及定量,同时通过模拟翻修,设计植骨范围,拟植入全髋关节假体规格.结果与结论 通过Mimics三维窗口,精确定位该破碎假体,碎片最大纵径预测33.68 mm,距离股骨头假体距离48.93 mm,距离髋臼假体20.14 mm.髋臼选取130.47 mm2可视区域平均阈值339.98,骨质缺损区130.47 mm2可视区域平均阈值-481.25,缺损面积21.41 mm×21.38 mm,根据三维模型评估骨质缺损并分类:AAOS分类ⅠB 型,Gross分类ⅡA 型,Engh分类Ⅰ型.结果 证实,在髋关节翻修中借助Mimics软件可优化置换方案及方式,减少并发症,降低置换风险.
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