Abstract
To explore the feasibility of 3D-printed navigation template in proximal femoral varus rotation and shortening osteotomy for older children with developmental dysplasia of the hip (DDH). Between June 2014 and May 2015, navigation templates were designed and used for 12 DDH patients. Surgical information and outcomes were compared to 13 patients undergoing the same surgery but without navigation template. In template-guided patient group, operation time (21.08 min vs. 46.92 min), number of X-ray exposures (3.92 vs. 6.69), and occurrence of femoral epiphysis damage (0 vs. 0.92) were significantly decreased (P < 0.05). Furthermore, after 12–18 months follow-up, 66.7% and 16.7% of the hips in template-guided group were rated as excellent or good, respectively, according to the McKay criteria; 83.3% and 16.7% by using the Severin criteria respectively. By contrast, 46.2% and 23.1% of the hips in traditional operation group were classed as excellent or good, respectively, using the McKay criteria; 46.2% and 30.8% by using the Severin criteria respectively. The template-guided group achieved a better outcome; however, there was no significant difference. Application of the navigation template for older DDH children can reduce the operation time, radiation exposure, and epiphysis damage, which also simplifies surgery and improves precision.
Highlights
ObjectivesThe aim of this study was to use digital 3D reconstruction and reverse modeling technology combined with 3D printing to produce a navigation template for this purpose
The patients’ average femoral neck anteversion angle was 53.33° and average neck–stem angle was 145.83° (128°–160°), which were consistent with the actual intraoperative findings
The needle channels in the template were perfectly matched with the screw holes of the Locking Compression Pediatric Hip Plate (LCP-PHP) and varus, and rotating, shortening osteotomy, and internal fixation were completed
Summary
The aim of this study was to use digital 3D reconstruction and reverse modeling technology combined with 3D printing to produce a navigation template for this purpose
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