AccScience Publishing / IJB / Online First / DOI: 10.36922/ijb.4074
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RESEARCH ARTICLE

Application of 3D-printed individualized porous tantalum buttress in shelf acetabuloplasty for developmental dysplasia of the hip

Yang Peng1,2,3 ,  Xin Chen1,2,3 ,  Juncai Xu1,2,3 ,  Ran Xiong1,2,3 ,  Chengjun Huang1,2,3 ,  Liu Yang1,2,3* ,  Guangxing Chen1,2,3*
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1 Center for Joint Surgery, The First Hospital Affiliated to Army Medical University, Chongqing, China
2 Chongqing Municipal Science and Technology Bureau Key Laboratory of Precision Medicine in Joint Surgery, Chongqing, China
3 Chongqing Municipal Education Commission Key Laboratory of Joint Biology, Chongqing, China
IJB 2024, 10(6), 4074 https://doi.org/10.36922/ijb.4074
Submitted: 28 June 2024 | Accepted: 19 August 2024 | Published: 20 August 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Shelf acetabuloplasty is a viable treatment for developmental dysplasia of the hip (DDH), yet autologous bone grafts have faced challenges such as morphological mismatch, imprecise placement, and long-term graft resorption. The rapid advancement of 3D printing technology in orthopedics has enabled the acquisition of digital image correlation method (DICM) data from patient pelvic to bilateral femoral proximal regions through computed tomography (CT) scans. These data are then utilized by software to create 3D models and design individualized metal implants. Using tantalum-based type I (TA1) spherical powder as the raw material, a porous tantalum buttress with a pore size of 600 microns and a porosity of 75% was fabricated employing the selective electron beam melting (SEBM) technology. Our Center has applied this 3D-printed individualized porous tantalum buttress in shelf acetabuloplasty for 21 DDH patients (25 hips), including 6 males and 15 females, with a mean age of 21.38 ± 7.39 years. The follow-up period ranged from 12 to 47 months, averaging 22.64 ± 10.86 months. At the final follow-up, patient-reported outcomes (PROs) were used to assess the patient’s subjective feelings. Significant improvements were observed in the Non-Arthritic Hip Score (NAHS), modified Harris Hip Score (mHHS), Hip Outcome Score-Sports Subscale (HOS-SSS), International Hip Outcome Tool-12 (iHOT-12), and Visual Analog Scale (VAS) compared with preoperative levels (p < 0.01). Radiographic assessments indicated that the postoperative lateral centeredge (LCE) angle, Tonnis angle, acetabular angle (Sharp’s angle), and femoral head coverage all trended towards normal, with statistically significant differences (p < 0.01). There was no implant displacement or bone resorption in any case, and no progression in Tonnis grading for hip osteoarthritis (OA) was noted postoperatively, with an 84% patient satisfaction rate. The early follow-up results of 3D-printed individualized porous tantalum buttress in shelf acetabuloplasty are satisfactory, indicating a reliable application prospect for the treatment of DDH patients.

Graphical abstract
Keywords
3D printing
Metal materials
Augmentation buttress
Hip
Shelf acetabuloplasty
Funding
This study was supported by the General Program of the National Natural Science Foundation of China (No. 82372365).
Conflict of interest
The authors declare they have no competing interests.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing
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