中文摘要：

背景：CT重建骨折三维模型不能进行虚拟复位、内固定,不能制定合理的修复方案,数字化设计可以满足临床骨科医师的需要。标准件库为虚拟及现实手术选择理想的内固定物提供了可能性,而3D打印使得合理的修复方案得以在临床准确实施。目的：分析在数字化软件设计配合3D打印模块基础上进行标准件库接骨板、螺钉导航置入内固定修复股骨远端骨折的方法,探讨其准确性、可行性及微创性。方法：19侧成人下肢解剖标本,连续进行薄层多平面CT扫描,采集Dicom格式图像。利用Mimics三维重建软件处理数据,按AO分型,虚拟制作股骨远端骨折A_（1-3）、B_（1-3）、C_（1-3）型各1例。从标准件库中选择接骨板、螺钉虚拟内固定。设计带钉道的导航模块,并通过3D打印机生产出实体模块,将导航模块在手术中进行导航放置接骨板、螺钉,观察卡位、板钉位置情况,利用X射线、CT扫描评价内固定置入效果。2将上述内固定方案临床应用于30例股骨远端骨折患者,记录手术时间、术中出血量及术后引流量,术后随访进行影像学评价及疗效评定。结果与结论：19侧解剖标本内固定术后再次行X射线、CT扫描,三维重建结果显示接骨板位置、螺钉进钉点,进钉方向、长度、直径均与Mimics软件中模拟预设的一致。导航模块和相对应的股骨远端外侧骨性结构贴合紧密,嵌合度良好,在导航应用时卡位及稳定性良好,可以很好指引接骨板放置、螺钉置入。2临床应用30例,手术时间（104.63±26.12）min,术中出血量（121.74±11.49）m L,术后引流量（30.29±6.38）m L。所有患者均获随访,根据Schatzker标准评定疗效,优22例,良6例,可2例,优良率为93%。修复术中应用术前选择的接骨板和螺钉规格,进钉长度、直径、位置、角度等与术前高度一致。3提示在3D打印导航模块的辅助下,股骨远端骨折标准件库接骨板内

英文摘要：

BACKGROUND： On CT reconstruction of three-dimensional（3D） model, fracture virtual reduction and internal fixation cannot be achieved, and reasonable operation scheme cannot be formulated. Digital design can fully meet the needs of clinical orthopedics physicians. Standard parts database can provide the possibility to choose the ideal internal fixation. 3D printing makes the reasonable operation scheme accurate in clinical implementation.OBJECTIVE： To discuss the feasibility, accuracy and minimal invasion of internal fixation in treatment of the distal femoral fracture with digital design of standard parts database by 3D printing. METHODS：（1） Nine adult lower extremity specimens were selected to take continuously thin-layer CT scanning. After Dicom images were imported into the mimics software, the model was established. According to the AO classification, they were classified into A_（1-3）, B_（1-3） and C_（1-3） types of distal femoral fracture by virtual design. Internal fixation with plate and screw formed standard parts database virtually. It was printed out the pilot hole of the navigation module design by three-dimensional printing forming technique. Plate and screw were inserted assisted by the module. X-ray and CT scan were taken postoperatively to access the position.（2） 30 patients with distal femoral fracture were subjected to above fixation. The operation time, intraoperative blood loss and postoperative drainage were recorded. Imaging and curative effects were evaluated during follow-up. RESULTS AND CONCLUSION：（1） Nine samples underwent X-ray and CT scan. 3D reconstruction results revealed plate position, screw entry point, nail direction, length and diameter were consistent with presetting data in Mimics software. The navigation models were designed to fit the lateral bony structure of distal femur. There were good fitting degree, good card position and good stability when the navigation was applied. It could guide plant and screw implantation.（2） In 30 cases, the