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Prospective randomized controlled trial on the accuracy of prosthesis positioning in total hip arthroplasty assisted by a newly designed whole-process robotic arm

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Abstract

Introduction

The purpose of this article is to study whether the newly designed whole-process total hip arthroplasty (THA) robotic arm can improve the accuracy of prosthesis placement in THA.

Method

In this study, 72 patients undergoing THA were prospectively included and randomly divided into two groups. The experimental group was treated with THA assisted by a newly designed robotic arm. The control group received THA with conventional surgical methods. The imaging data were compared after operation.

Result

Compared with the conventional operation, the whole-process robotic arm can more accurately place the acetabular prosthesis in the anteversion safe zone of 5 ~ 25°, but in terms of the inclination angle, whether the reference is the safe zone of 30 ~ 50° or 30 ~ 45°, there is no statistical difference between the two groups. The average lower limb length discrepancy (LLLD) in the experimental group was 3.77 ± 8.31 mm longer than contralateral side, while the counterpart in the control group was 8.39 ± 9.11 mm, with significant difference (P = 0.029). The femoral prosthesis was fixed in neutral position in 35 (100%) cases in the experimental group and only 30 (83.3%) in the control group (P = 0.036). There was no significant difference in the recovery of hip offset, femoral anteversion, and canal fill ratio (CFR) between the two groups.

Conclusion

Robotic arm can improve the accuracy of anteversion of acetabular cup, restore the consistency of the length of lower limbs, and more accurately implant the femoral prosthesis to the neutral position in the coronal position.

Clinical trial registration number

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

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Author information

Authors and Affiliations

  1. Department of Joint Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000, Shandong, China

    Wenzhe Wang, Zian Zhang, Hao Xu, Xinzhe Lu, Yikai Liu, Chenkai Li & Haining Zhang

  2. Nursing Department of Operating Room, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China

    Guanrong Wang & Chun Rong

Authors
  1. Wenzhe Wang
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  2. Zian Zhang
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  3. Guanrong Wang
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  4. Chun Rong
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  5. Hao Xu
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  6. Xinzhe Lu
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  7. Yikai Liu
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  8. Chenkai Li
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  9. Haining Zhang
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Contributions

WW wrote the paper. CL, YL, and XL collected the data and participated in writing and revising the paper. HZ, HX, ZZ, GW, and CR performed THA procedures. HNZ designed the whole study. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Haining Zhang.

Ethics declarations

Ethics approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of the Affiliated Hospital of Qingdao University (Ethical approval No. QYFYEC2020-01701).

Consent to participate

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

Consent for publication

Not applicable.

Competing interests

The authors declare no competing interests.

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Wang, W., Zhang, Z., Wang, G. et al. Prospective randomized controlled trial on the accuracy of prosthesis positioning in total hip arthroplasty assisted by a newly designed whole-process robotic arm. International Orthopaedics (SICOT) 47, 413–419 (2023). https://doi.org/10.1007/s00264-022-05501-2

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  • DOI: https://doi.org/10.1007/s00264-022-05501-2

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