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Accuracy of Computer Navigation for Acetabular Component Placement in THA

  • Basic Research
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

The accuracy and precision of any computer-aided surgical device is critical to its utility. We asked the following question: how accurate and precise are the values measured by an imageless computer navigation system as compared with those measured using postoperative CT scans? Twenty-five patients (26 hips) underwent primary THA using an imageless computer navigation system for placement of the acetabular component. Inclination and anteversion were measured in the operative coordinate system as defined by Murray. Accuracy, precision, and bias were computed, and Bland-Altman analysis was used to assess levels of agreement. The accuracy (mean ± standard deviation of the absolute difference between computer-assisted navigation and CT) was 1.8° ± 1.2° for inclination and 2.0° ± 2.0° for anteversion. Precision was 3.4° for inclination and 5.5° for anteversion. Bias was 0.52° for inclination and 0.35° for anteversion. Limits of agreement were 4.26° for inclination and 5.58° for anteversion. An imageless computer navigation system can precisely determine acetabular cup position.

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Author information

Authors and Affiliations

  1. Department of Orthopaedics, Hospital for Special Surgery, New York, NY, USA

    James A. Ryan MD

  2. Department of Orthopaedic Surgery, UC Davis Medical Center, Sacramento, CA, USA

    Amir A. Jamali MD

  3. Joint Surgeons of Sacramento, Sutter General Hospital, 1020 29th Street, Suite 450, Sacramento, CA, 95816, USA

    William L. Bargar MD

Authors
  1. James A. Ryan MD
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  2. Amir A. Jamali MD
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  3. William L. Bargar MD
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Corresponding author

Correspondence to William L. Bargar MD.

Additional information

One or more of the authors (WLB) have received funding from DePuy Orthopaedics, Inc, Warsaw, IN.

Each author certifies that his or her institution has approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

This work was performed at the Sutter General Hospital.

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Ryan, J.A., Jamali, A.A. & Bargar, W.L. Accuracy of Computer Navigation for Acetabular Component Placement in THA. Clin Orthop Relat Res 468, 169–177 (2010). https://doi.org/10.1007/s11999-009-1003-7

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  • DOI: https://doi.org/10.1007/s11999-009-1003-7

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