Errors in femoral anteversion, femoral offset, and vertical offset following robot-assisted total hip arthroplasty.

Journal: The international journal of medical robotics + computer assisted surgery : MRCAS
Published Date: Apr 1, 2020

Abstract

The objectives were to determine errors in femoral anteversion (FA), femoral offset (FO), and vertical offset (VO) with robot-assisted total hip arthroplasty (THA) and how consistently these errors are within clinically desirable limits of ±5° and ±5 mm. After preoperative planning, robot-assisted THAs were performed on twelve cadaveric specimens. The error between achieved and planned component placements was used to determine bias (mean error) and precision (SD of error). The percent of the population within clinically desirable limits was determined. Bias of 1.5° and 2.7 mm occurred for FA and VO, respectively. Precision was 1.2° for FA and better than 1.5 mm for FO and VO. The percent of population within clinically desirable limits was at least 95% for FA and at least 99% for FO. With limits of ±7 mm, at least 95% of the population was within these limits for VO. Robot-assisted THA may improve clinical outcomes.

Authors

  • Chih-Ming Hsieh
    Department of Biomedical Engineering, University of California, Davis, Sacramento, California, USA.
  • Stephen M Howell
    Department of Biomedical Engineering, University of California Davis, One Shields Avenue Davis, CA 95616, USA.
  • Maury L Hull
    Department of Biomedical Engineering, University of California Davis, One Shields Avenue Davis, CA 95616, USA; Department of Mechanical Engineering, University of California Davis, One Shields Avenue, Davis, CA 95616-5270, USA; Department of Orthopaedic Surgery, University of California Davis, 4860 Y Street, Suite 3800, Sacramento, CA 95817, USA. Electronic address: mlhull@ucdavis.edu.

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