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. 2021 Feb 19:2021:6621882.
doi: 10.1155/2021/6621882. eCollection 2021.

3D Printed Guides and Preoperative Planning for Uncemented Stem Anteversion Reconstruction during Hip Arthroplasty: A Pilot Study

Yingqi Zhang  1 , Zhitao Rao  1 , Jincheng Zhang  1 , Shijie Li  2 , Shimin Chang  2 , Yeqing Sun  1
Affiliations

3D Printed Guides and Preoperative Planning for Uncemented Stem Anteversion Reconstruction during Hip Arthroplasty: A Pilot Study

Yingqi Zhang et al. Biomed Res Int. .

Retraction in

Abstract

Objective: To investigate if 3D printed guides and preoperative planning can accurately control femoral stem anteversion.

Methods: A prospective comparative study was carried out from 2018 to 2020, including 53 patients who underwent hip arthroplasty for femoral neck fracture. The target rotation center of the femoral head is determined by three-dimensional planning. In group A, planning was made by 2D templates. In group B, preoperative 3D planning and 3D printed osteotomy/positioning guides were performed. After the operation, 3D model registration was performed to calculate the accuracy of anteversion restoration.

Results: We screened 60 patients and randomized a total of 53 to 2 parallel study arms: 30 patients to the group A (traditional operation) and 23 patients to the group B (3D preoperative planning and 3D printed guide). There were no significant differences in demographic or perioperative data between study groups. The restoration accuracy of group A was 5.42° ± 3.65° and of group B was 2.32° ± 1.89°. The number and rate of abnormal cases was 15 (50%) and 2 (8.7%), respectively. Significant statistical differences were found in angle change, restoration accuracy, and number of abnormal cases.

Conclusion: Three-dimensional preoperative planning and 3D printed guides can improve the accuracy of the restoration of femoral anteversion during hip arthroplasty.

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Conflict of interest statement

All authors declare no conflict of interest in the research.

Figures

Figure 1
Figure 1
Fracture modeling build an independent three-dimensional model of fracture through CT.
Figure 2
Figure 2
Mirror/virtual fracture reduction, fitting articular surface to determine the target rotation center: front view (a); side view (b); the red circle is the fitting sphere, and the green dot is the planned center.
Figure 3
Figure 3
Simulated placement of femoral prosthesis: front view (a), lateral view (b), and top view (c).
Figure 4
Figure 4
Design of femoral neck osteotomy guide (a) and prosthesis positioning guide (b).
Figure 5
Figure 5
Guide plate printing (a), intraoperative osteotomy (b), intraoperative medullary cavity formation (c), and intraoperative implantation of femoral stem (d).
Figure 6
Figure 6
Postoperative modeling and registration (a). Fit the postoperative rotation center (b). Calculate the preoperative planning, the actual postoperative anteversion angle, and the difference (c). Red sphere indicates the planned center; blue sphere indicates the actual center.
See this image and copyright information in PMC

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