Abstract
Purpose
Reconstruction of severe acetabular deficiency is extremely challenging in total hip arthroplasty (THA) revisions. Novel bispherical augments were designed to fill acetabular bone loss and facilitate restoration of hip center of rotation (HCOR). Current study aims to compare the outcomes of bispherical augments and tantalum augments.
Methods
Between July 2017 and December 2018, bispherical augments (BA group) were implanted in 25 patients (25 hips) and 22 patients (22 hips) underwent porous tantalum augments (TA group) reconstruction in revision THA. Clinical and radiographic results were evaluated for 25 hips in BA group and 20 hips in TA group at the final follow-up. The mean duration of follow-up was 2.9 years (range, 2.2 ~ 3.7) in BA group and 2.9 years (range, 2.3 ~ 3.8) in TA group.
Results
Harris hip scores, HCOR, and leg length discrepancy (LLD) correction did not differ between the treatment groups. The bispherical augments were located more closer to the medial-superior part (zone II) of acetabular shell while the majority of tantalum augments were located at the lateral-superior part (zone I) (P = 0.010). More screws were used in the BA group for augment fixation (mean 2.1 vs. 1.3) (P = 0.000). There was no evidence of loosening or migration in all hips. Only one dislocation occurred in BA group and treated with closed reduction, no recurrence of instability up to the final follow-up.
Conclusion
The clinical and radiological outcomes of bispherical augments were comparable with tantalum augments; this technique was a reliable alternative method in severe acetabular deficiency reconstruction.
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Funding
This work was supported by the National Natural Science Foundation of China (81902201, 82072408), the Scientific Research Fund of Academic and Technical Leaders of Anhui Province (2020D259), and the Fundamental Research Funds for the Central Universities (WK9110000093).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Guoyuan Li, Xiaoqi Zhang, Min Chen, and Zhengliang Luo. Operations were performed by Xiaofeng Ji and Xifu Shang. The first draft of the manuscript was written by Guoyuan Li and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. The first two authors contributed equally to this manuscript.
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Approval was obtained from the ethics committee of The First Affiliated Hospital of University of Science and Technology of China. The procedures used in this study adhere to the tenets of the Declaration of Helsinki.
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Li, Gy., Zhang, Xq., Chen, M. et al. Modular revision strategy with bispherical augments in severe acetabular deficiency reconstruction. International Orthopaedics (SICOT) 46, 215–222 (2022). https://doi.org/10.1007/s00264-021-05195-y
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DOI: https://doi.org/10.1007/s00264-021-05195-y