Clinical Orthopaedics and Related Research®

, Volume 470, Issue 11, pp 3187–3194 | Cite as

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

  • Thomas J. Kibsgård
  • Olav Røise
  • Britt Stuge
  • Stephan M. Röhrl
Basic Research



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.


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.


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.


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.


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.


Condition Number Phantom Experiment Phantom Model Pelvic Girdle Pain Cranial Part 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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.


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Copyright information

© The Association of Bone and Joint Surgeons® 2012

Authors and Affiliations

  • Thomas J. Kibsgård
    • 1
  • Olav Røise
    • 1
    • 2
  • Britt Stuge
    • 1
  • Stephan M. Röhrl
    • 1
  1. 1.Division of Surgery and Clinical Neuroscience, Department of OrthopaedicsOslo University HospitalOsloNorway
  2. 2.Institute of Clinical Medicine, Faculty of MedicineUniversity of OsloOsloNorway

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