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Effect of screw fixation on acetabular component alignment change in total hip arthroplasty

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Abstract

Purpose

The use of screws can enhance immediate cup fixation, but the influence of screw insertion on cup position has not previously been measured. The purpose of this study was to quantitatively evaluate the effect of intra-operative screw fixation on acetabular component alignment that has been inserted with the use of a navigation system.

Methods

We used a navigation system to measure cup alignment at the time of press-fit and after screw fixation in 144 hips undergoing total hip arthroplasty. We also compared those findings with factors measured from postoperative radiographs.

Results

The mean intra-operative change of cup position was 1.78° for inclination and 1.81° for anteversion. The intra-operative change of anteversion correlated with the number of screws. The intra-operative change of inclination also correlated with medial hip centre.

Conclusion

The insertion of screws can induce changes in cup alignment, especially when multiple screws are used or if a more medial hip centre is required for rigid acetabular fixation.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-Cho Chuo-Ku, Kobe, Hyogo, 650-0017, Japan

    Takaaki Fujishiro, Shinya Hayashi, Noriyuki Kanzaki, Shingo Hashimoto & Masahiro Kurosaka

  2. Department of Orthopaedic Surgery, Kobe Kaisei Hospital, 3-11-15 Shinohara Kitamachi, Nada-Ku, Kobe, Hyogo, 657-0068, Japan

    Nao Shibanuma

Authors
  1. Takaaki Fujishiro
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  2. Shinya Hayashi
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  3. Noriyuki Kanzaki
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  4. Shingo Hashimoto
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  5. Nao Shibanuma
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  6. Masahiro Kurosaka
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Corresponding author

Correspondence to Takaaki Fujishiro.

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Fujishiro, T., Hayashi, S., Kanzaki, N. et al. Effect of screw fixation on acetabular component alignment change in total hip arthroplasty. International Orthopaedics (SICOT) 38, 1155–1158 (2014). https://doi.org/10.1007/s00264-013-2271-0

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  • DOI: https://doi.org/10.1007/s00264-013-2271-0

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