Combined anteversion of the total hip arthroplasty implanted with image-free cup navigation and without stem navigation

  • Shigeo Fukunishi | f9457@hyo-med.ac.jp Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.
  • Tomokazu Fukui Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.
  • Shoji Nishio Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.
  • Yuki Fujihara Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.
  • Shohei Okahisa Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.
  • Shinichi Yoshiya Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan.

Abstract

In total hip arthroplasty (THA), combined anteversion (CA), the sum of cup anteversion (AV) and stem antetorsion (AT) are used as parameters to assess the appropriateness of overall prosthetic alignment. In this study, we evaluated the CA value based on the post-operative computed tomography (CT) measurements in our patient population who underwent THA using the OrthoPilotTM image-free navigation system (B/BRAUN-Aesculap, Tuttlingen, Germany). During surgery, cup alignment was adjusted with the use of the navigation system while the positioning of the femoral stem was arbitrarily adjusted by the surgeon. Seventy-nine THAs were included in the study. Post-operative CT assessment for the prosthetic alignment showed the average cup inclination and AV values to be 40.5°±4.1° and 20.6°±4.6°, respectively, demonstrating the effectiveness of the navigation system by small values of standard deviation. By contrast, the AT value measured for the stem showed wide variability (mean 23.6°±11.2°). Consequently, the resulting CA was also inconsistent (mean 44.4°±11.2°) and only 61 of the 79 THAs (77.2%) were defined as satisfactory.

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Published
2012-11-28
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Original Articles
Keywords:
combined anteversion, THA, image free navigation
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How to Cite
Fukunishi, S., Fukui, T., Nishio, S., Fujihara, Y., Okahisa, S., & Yoshiya, S. (2012). Combined anteversion of the total hip arthroplasty implanted with image-free cup navigation and without stem navigation. Orthopedic Reviews, 4(4), e33. https://doi.org/10.4081/or.2012.e33

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