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Improved radiographic outcomes and decreased complications rate on the femoral side can be achieved by a novel designed whole-process robotic assisted hip system for total hip arthroplasty: a prospective randomized controlled trial

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Abstract

Postoperative complications due to inaccurate prosthesis positioning are the main causes of early revision. The aim of this study was to (1) determine whether novel designed whole-process robotic assisted hip system allowed better radiographic outcomes and lower complications risk on the femoral side particularly stem subsidence compared to conventional THA, and to (2) identify the comparison of early clinical outcomes. 72 patients were initially enrolled and randomly divided into 2 groups. Finally, only 65 patients (31 RA-THAs, 34 C-THAs) were analyzed who had full 18-month follow-up data. Radiographic follow-up was performed at immediate and 6-month postoperatively, while clinical follow-up at 18-month postoperatively. Stem-related radiographic outcomes, femoral side complications and clinical scores were compared. The robotic arm allowed better radiographic outcomes of the femoral side, including a higher canal fill ratio (CFR) at B1 (P = 0.040), more neutral stem alignment (P = 0.029), lower subsidence (P = 0.023) and lower leg length discrepancy (LLD) (P = 0.010). In addition, low CFR at B1 (P = 0.001) was found the risk factor for subsidence. However, early clinical outcomes were consistent between both groups. The novel designed whole-process robotic assisted hip system covers both femoral and acetabular side operations. It allows accurate and safe manipulation of femoral side, including better stem-related radiographic outcomes and lower risk of subsidence and LLD. However, no advantage of robotic system in early clinical score was identified. Clinical trial registration number: ChiCTR2100044124.

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No datasets were generated or analysed during the current study.

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Funding

The authors declare that no funds, grants, or other support was received during the preparation of this manuscript.

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Authors and Affiliations

Authors

Contributions

ZH: completed all the table and figure, wrote the paper, and edited the manuscript. ZZ: collected the data and revised the paper. WW: measured the imaging parameters. XL: analyzed the statistics. HZ: designed the whole study and revised the manuscript. All the authors have read and approved the final manuscript.

Corresponding author

Correspondence to Haining Zhang.

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The authors declare that they have no competing interests.

Ethical approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Institutional Review Board of The Affiliated Hospital of Qingdao University (QYFYEC2020-017-01).

Clinical trial registration number

ChiCTR2100044124 (date of registration: 2021-3-11).

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Informed consent was obtained from all individual participants included in the study.

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The authors affirm that human research participants provided informed consent for publication of the images in all figures.

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Huang, Z., Zhang, Z., Wang, W. et al. Improved radiographic outcomes and decreased complications rate on the femoral side can be achieved by a novel designed whole-process robotic assisted hip system for total hip arthroplasty: a prospective randomized controlled trial. J Robotic Surg 18, 79 (2024). https://doi.org/10.1007/s11701-024-01835-8

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