Mimics软件重建距骨模型结合踝后内侧入路治疗距骨后突骨折

目的评价术前Mimics软件重建距骨后突骨折三维模型,结合踝后内侧入路治疗距骨后突骨折的优势。方法回顾性分析北京积水潭医院创伤骨科2015年5月至2019年2月采用术前Mimics软件重建距骨后突骨折三维模型结合踝后内侧入路治疗的7例距骨后突骨折患者资料。男5例,女2例;年龄20~70岁,平均39岁。术前常规行CT检查,应用Mimics软件基于CT扫描数据三维重建距骨后突以明确骨折块大小、数量和移位程度,踝后内侧入路切开复位螺钉内固定治疗距骨后突骨折。术后采用美国足踝外科协会(AOFAS)的踝-后足评分系统评估功能恢复情况。结果本组患者手术时间70~105 min,平均87.1 min。术后早期伤口均愈合良好,无神经、肌腱损伤。所有患者术后随访4~24个月,平均12个月。10~16周复查X线片骨折愈合,未发现断钉、骨不连和畸形愈合及创伤性关节炎等并发症发生。末次随访时AOFAS的踝-后足评分为80~98分,平均87分。结论术前CT影像基于Mimics软件重建距骨后突骨折三维模型可精确定位进钉点和进钉方向,用于踝后内侧入路术中有清楚显露、骨折易复位、置钉方便的优势。

Reconstruction of talus model with Mimics software for treatment of talar posterior process fracture through posteromedial malleolar approach

Objective To evaluate the advantages of reconstructing by mimics software before operation a three-dimensional model of talar posterior process fracture which is to be used in the treatment of talar posterior process fracture through the posteromedial malleolar approach.Methods From May 2015 to February 2019,7 patients with talar posterior process fracture were treated at Department of Orthopaedic Trauma,Jishuitan Hospital.They were 5 men and 2 women,aged from 20 to 70 years(mean,39 years).They underwent routine CT examination preoperatively.Their posterior process of talus was reconstructed by Mimics software based on their CT scanning data before operation to determine the size,number and displacement of fracture fragments.Their fractures of posterior process of talus were treated by open reduction and screw fixation in prone position through the posterior ankle approach.The American Orthopedic Foot&Ankle Society(AOFAS)ankle-hindfoot scoring system was used to evaluate functional recovery.Results The operation time for this group ranged from 70 min to 105 min,averaging 87.1 min.Early after operation,the wounds healed well with no injury to nerves or tendons.All patients were followed up for 4 to 24 months(average,12 months).Follow-up by X-ray examination after 10 to 16 weeks revealed fracture union with no complications like screw breakage,nonunion,malunion or traumatic arthritis.Their AOFAS ankle-hindfoot scores at the final follow-up ranged from 80 to 98 points.Conclusion Preoperative three-dimensional reconstruction of talar posterior process fracture based on CT images using Mimics software can accurately determine the entry point and direction of screw insertion,yielding advantages of clear exposure,easy reduction and convenient screwing in the treatment of talar posterior process fracture through the posteromedial malleolar approach.