Development of an RSA calibration system with improved accuracy and precision

Cai, Rongyi; Yuan, Xunhua; Rorabeck, Cecil H.; Bourne, Robert B.; Holdsworth, David W.

doi:10.1016/j.jbiomech.2007.11.012

Cited by 22 publications

(27 citation statements)

References 27 publications

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“…This correlates with the anterior-posterior translations (z-axis) in our study of tibial plateau fractures. Cai et al (2008) also found reduced precision in the z-axis using the uniplanar set-up. The error of translations in this axis was approximated to be 3 times greater than in the x- and y-axis (Yuan and Ryd 2000).…”

Section: Discussionmentioning

confidence: 88%

“…To date, in vitro phantom studies have used displacement control via translation or rotation stages. Considerable disparity exists between the 5 methods that have been published regarding displacement-controlled accuracy and precision assessment of RSA in total hip arthroplasty and distal radius fracture models (Onsten et al 2001, Bragdon et al 2002, 2004, Madanat et al 2005, Cai et al 2008). Variations in micrometer resolution, in methods of image acquisition, in software analysis, and in the presentation of statistical results make direct comparisons between these studies difficult.…”

Section: Introductionmentioning

confidence: 99%

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The accuracy and precision of radiostereometric analysis in monitoring tibial plateau fractures

et al. 2010

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Background and purposeThe application of radiostereometric analysis (RSA) to monitor stability of tibial plateau fractures during healing is both limited and yet to be validated. We therefore evaluated the accuracy and precision of RSA in a tibial plateau fracture model.MethodsCombinations of 3, 6, and 9 markers in a lateral condyle fracture were evaluated with reference to 6 proximal tibial arrangements. Translation and rotation accuracy was assessed with displacement-controlled stages, while precision was assessed with dynamic double examinations. A comparison of error according to marker number and arrangement was completed with 2-way ANOVA models.ResultsThe results were improved using more tantalum markers in each segment. In the fracture fragment, marker scatter in all axes was achieved by a circumferential arrangement (medial, anterior, and lateral) of the tantalum markers above the fixation devices. Markers placed on either side of the tibial tuberosity and in the medial aspect of the fracture split represented the proximal tibial reference segment best. Using 6 markers with this distribution in each segment, the translation accuracy (root mean square error) was less than 37 μm in all axes. The precision (95% confidence interval) was less than ± 16 μm in all axes in vitro. Rotation, tested around the x-axis, had an accuracy of less than 0.123° and a precision of ± 0.024°.InterpretationRSA is highly accurate and precise in the assessment of lateral tibial plateau fracture fragment movement. The validation of our center's RSA system provides evidence to support future clinical RSA fracture studies.

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Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The accuracy and precision of radiostereometric analysis in monitoring tibial plateau fractures

et al. 2010

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“…For example, Nebergall et al have recently reported that precision of RSA is improved if the ellipse of the shell is used in combination with markers in the liner. Future improvements in radiographic acquisition, software, or calibration cage design may further improve accuracy of RSA measurements.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of methods to measure femoral head penetration within metal-backed acetabular components

et al. 2016

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A number of different software programs are used to investigate the in vivo wear of polyethylene bearings in total hip arthroplasty. With wear rates below 0.1 mm/year now commonly being reported for highly cross-linked polyethylene (XLPE) components, it is important to identify the accuracy of the methods used to measure such small movements. The aims of this study were to compare the accuracy of current software programs used to measure two-dimensional (2D) femoral head penetration (FHP) and to determine whether the accuracy is influenced by larger femoral heads or by different methods of representing the acetabular component within radiostereometric analysis (RSA). A hip phantom was used to compare known movements of the femoral head within a metal-backed acetabular component to FHP measured radiographically using RSA, Hip Analysis Suite (HAS), PolyWare, Ein Bild Roentgen Analyse (EBRA), and Roentgen Monographic Analysis Tool (ROMAN). RSA was significantly more accurate than the HAS, PolyWare, and ROMAN methods when measuring 2D FHP with a 28 mm femoral head. Femoral head size influenced the accuracy of HAS and ROMAN 2D FHP measurements, EBRA proximal measurements, and RSA measurements in the proximal and anterior direction. The use of different acetabular reference segments did not influence accuracy of RSA measurements. The superior accuracy and reduced variability of RSA wear measurements allow much smaller cohorts to be used in RSA clinical wear studies than those utilizing other software programs. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:988-996, 2017.

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“…The sparse model was generated through a conventional RSA examination using UmRSA software (RSA Biomedical, Umea, Sweden). The dedicated RSA system was previously described, 35 and is capable of measuring marker positions to within 50 μm. 36 A six axis articulated robot (Model A465 Arm + C500C Controller, Thermo CRS Ltd., Ontario, Canada) was em- ployed to apply motion to the TKR model.…”

Section: Iic1 Dynamic Tkr Phantommentioning

confidence: 99%

Measurement of joint kinematics using a conventional clinical single‐perspective flat‐panel radiography system

et al. 2012

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This study demonstrates the ability to accurately measure knee-joint kinematics using a single-plane radiographic measurement technique. The measurement technique can be easily implemented at most clinical centers equipped with a modern-day radiographic x-ray system. The dose of ionizing radiation associated with the image acquisition represents a minimal risk to any subjects undergoing the examination.

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Development of an RSA calibration system with improved accuracy and precision

Cited by 22 publications

References 27 publications

The accuracy and precision of radiostereometric analysis in monitoring tibial plateau fractures

The accuracy and precision of radiostereometric analysis in monitoring tibial plateau fractures

Accuracy of methods to measure femoral head penetration within metal-backed acetabular components

Measurement of joint kinematics using a conventional clinical single‐perspective flat‐panel radiography system

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