Three-dimensional printing digital navigation modules-assisted accurate placement of femoral neck hollow lag screws

doi:10.3969/j.issn.2095-4344.2016.53.011

Abstract

Abstract:

BACKGROUND: Computer-assisted orthopedic technique can help physicians develop more accurate preoperative planning and surgical simulation. 3D printing technology erects a bridge for the virtual design and implementation, and the design of the surgical program will be accurately put into practice.

OBJECTIVE: To investigate Mimics software digital design combined with 3D printing navigation modules-assisted accurate placement of femoral neck hollow lag screw, verify on corpse specimen, and observe its effects.

METHODS: Ten adult cadaveric pelvic specimens were used to make 20 models of femoral neck fracture. After continuous thin-slice CT scan, Dicom format images were collected for three-dimensional (3D) reconstruction by using Mimics software to identify the path of hollow lag screw and for 3D measurement. According to anatomic structure of bone surface, navigation modules with screw path were designed for 3D printing. The screw was implanted and the fixation was finished. The position and screw placement were observed. CT scanning was used to evaluate its effects.

RESULTS AND CONCLUSION: Totally 20 navigation modules were designed and 60 screws were implanted to observe the bone around femoral head and femoral neck. No screw penetration occurred. After surgery, reconstruction with CT scanning found that compared with preoperatively, the site, direction and length of screw insertion were consistent with that established by Mimics software. The accuracy rate was 100%. The navigation modules were closely bonded to the corresponding bony structure of greater trochanter of femur. Chimerism was good. The position and stability were good in the application. These results suggested that with the help of digital design and 3D printing navigation module, femoral neck hollow lag screw can be accurately placed into the ideal position.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Femoral Neck Fractures, Surgery, Computer-Assisted, Tissue Engineering

CLC Number:

R318

Chen Xu, Yu Zheng-xi, Chen Xuan-huang, Zhang Guo-dong, Wu Xian-wei, Cai Han-hua, Wu Chang-fu, Dai Yu-lin. Three-dimensional printing digital navigation modules-assisted accurate placement of femoral neck hollow lag screws[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(53): 7979-7984.

Figures/Tables 1

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