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Precision and Accuracy Measurement of Radiostereometric Analysis Applied to Movement of the Sacroiliac Joint

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

Abstract

Background

Different techniques have been used to quantify the movement of sacroiliac (SI) joints. These include radiostereometric analysis (RSA), but the accuracy and precision of this method have not been properly evaluated and it is unclear how many markers are required and where they should be placed to achieve proper accuracy and precision.

Purpose

The purpose of this study was to test accuracy and precision of RSA, applied to the SI joint, in a phantom model and in patients.

Methods

We used a plastic phantom attached to a micrometer to obtain a true value of the movement of the SI joint and compared this value with the measured value obtained by RSA; the difference represented the accuracy. The precision of the system was measured by double examination in the phantom and in six patients, and was expressed by a limit of significance (LOS). We analyzed different marker distributions to find optimal marker placement and number of markers needed.

Results

The accuracy was high and we identified no systematic errors. The precision of the phantom was high with a LOS less than 0.25° and 0.16 mm for all directions, and in patients, the precision was less than 0.71° for rotations and 0.47 mm translations. No markers were needed in the pubic symphysis to obtain good precision.

Conclusions

The accuracy and precision are high when RSA is used to measure movement in the SI joint and support the use of RSA in research of SI joint motion.

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Acknowledgments

We acknowledge the assistance of Alexis Hinojosa (MRI radiographer; Department of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway) with the RSA radiographs and analyses and Ingar Holme PhD (statistician, Department of Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway) for help with statistics.

Author information

Authors and Affiliations

  1. Division of Surgery and Clinical Neuroscience, Department of Orthopaedics, Oslo University Hospital, Pb 4950 Nydalen, 0424, Oslo, Norway

    Thomas J. Kibsgård MD, Olav Røise MD, PhD, Britt Stuge PT, PhD & Stephan M. Röhrl MD, PhD

  2. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway

    Olav Røise MD, PhD

Authors
  1. Thomas J. Kibsgård MD
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  2. Olav Røise MD, PhD
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  3. Britt Stuge PT, PhD
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  4. Stephan M. Röhrl MD, PhD
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Corresponding author

Correspondence to Thomas J. Kibsgård MD.

Additional information

One or more of the authors (TK, OR, BS) have received funding from the Norwegian Foundation for Health and Rehabilitation. Each author certifies that he or she, or a member of their immediate family, has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.

Each author certifies that his or her institution 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 Oslo University Hospital, Oslo, Norway.

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Kibsgård, T.J., Røise, O., Stuge, B. et al. Precision and Accuracy Measurement of Radiostereometric Analysis Applied to Movement of the Sacroiliac Joint. Clin Orthop Relat Res 470, 3187–3194 (2012). https://doi.org/10.1007/s11999-012-2413-5

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  • DOI: https://doi.org/10.1007/s11999-012-2413-5

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