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

Chih-Ming Hsieh; Stephen M Howell; Maury L Hull

doi:10.1002/rcs.2104

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

Int J Med Robot. 2020 Aug;16(4):e2104. doi: 10.1002/rcs.2104. Epub 2020 Apr 1.

Authors

Chih-Ming Hsieh¹, Stephen M Howell¹, Maury L Hull^{1

2

3}

Affiliations

¹ Department of Biomedical Engineering, University of California, Davis, Sacramento, California, USA.
² Department of Mechanical Engineering, University of California, Davis, Sacramento, California, USA.
³ Department of Orthopaedic Surgery, University of California, Davis, Sacramento, California, USA.

PMID: 32163669
DOI: 10.1002/rcs.2104

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.

Keywords: 3D models; TCAT; bias and precision; cadaver; registration.

MeSH terms

Arthroplasty, Replacement, Hip*
Femur / surgery
Hip Prosthesis*
Humans
Robotics*
Tomography, X-Ray Computed

Abstract

MeSH terms

Grants and funding