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Accuracy of Low Dose Computed Tomography Scanogram for Measurement of Femoral Version after Locked Intramedullary Nailing

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Abstract

Purpose

This prospective study was performed to compare the accuracy of femoral version measurements following repair of femoral shaft fractures using computed tomography (CT) scanograms with 10 % of the standard dose of ionizing radiation versus standard-dose scanograms.

Methods

CT scanogram protocols that used 90 and 10 % of the usual dose of ionizing radiation were developed. Ten patients with comminuted femoral shaft fractures repaired with either an intramedullary (IM) nail or plate were imaged with both high- and low-dose CT scanograms. Postoperative version of both femurs was measured and compared between the two dose scans using the Bonesetter application. This was a prospective blinded controlled study at a level 1 trauma centre. Statistical analysis was performed, including standard deviation (SD) and paired t test. Significance was set at p < 0.05.

Results

Comparison of femoral version measurements between the 90 and 10 % dose scanograms on the native and repaired sides were insignificant (p = 0.870 and p = 0.737, respectively). The difference between native and repaired femurs had an average error of 2.0 ± 1.1° for both the high- and low-dose scans and was insignificant (p = 0.742).

Conclusions

Reducing the dose of ionizing radiation in a CT scanogram by 90 % has no significant effect on the accuracy of femoral version measurement. This simple change can significantly reduce patient radiation exposure while accurately measuring femoral version and length.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Detroit Medical centre/Wayne State University, 4201 St.Antoine, UHC 6A, Detroit, MI, 48201, USA

    Kristi Lynn Hultman, Rahul Vaidya & Jon Brandon Carlson

  2. Department of Urology, Detroit Medical centre, Detroit, MI, USA

    Ibraheem Malkawi & Jason Benjamin Wynberg

Authors
  1. Kristi Lynn Hultman
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  2. Rahul Vaidya
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  3. Ibraheem Malkawi
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  4. Jon Brandon Carlson
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  5. Jason Benjamin Wynberg
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Corresponding author

Correspondence to Kristi Lynn Hultman.

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The authors have no conflicts of interest to declare.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Hultman, K.L., Vaidya, R., Malkawi, I. et al. Accuracy of Low Dose Computed Tomography Scanogram for Measurement of Femoral Version after Locked Intramedullary Nailing. International Orthopaedics (SICOT) 40, 1955–1960 (2016). https://doi.org/10.1007/s00264-015-3040-z

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  • DOI: https://doi.org/10.1007/s00264-015-3040-z

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