Reorienting the tibial baseplate improves the registration accuracy of model-based radiostereometric analysis

Accurate measurements of in-vivo hip kinematics may elucidate the mechanisms responsible for impaired function and chondrolabral damage in hips with femoroacetabular impingement (FAI). The objectives of this study were to quantify the accuracy and demonstrate the feasibility of using dual fluoroscopy to measure in-vivo hip kinematics during clinical exams used in the assessment of FAI. Steel beads were implanted into the pelvis and femur of two cadavers. Specimens were imaged under dual fluoroscopy during the impingement exam, FABER test, and rotational profile. Bead locations measured with model-based tracking were compared with those measured using dynamic radiostereometric analysis. Error was quantified by bias and precision, defined as the average and standard deviation of the differences between tracking methods, respectively. A normal male volunteer was also imaged during clinical exams. Bias and precision along a single axis did not exceed 0.17 and 0.21 mm, respectively. Comparing kinematics, positional error was less than 0.48 mm and rotational error was less than 0.58°. For the volunteer, kinematics were reported as joint angles and bone-bone distance. These results demonstrate that dual fluoroscopy and model-based tracking can accurately measure hip kinematics in living subjects during clinical exams of the hip.

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Pose-induced effects of femur and tibia on accuracy of model-based radiostereometric analysis

Computer Methods in Biomechanics and Biomedical Engineering Imaging & Visualization ◽

10.1080/21681163.2017.1278620 ◽

2017 ◽

Vol 6 (5) ◽

pp. 556-563

Author(s):

Shang-Chih Lin ◽

Chang-Hung Huang ◽

Chi-Pin Hsu ◽

Shih-Sheng Chang ◽

Pang-Hsin Hsieh ◽

...

Keyword(s):

Radiostereometric Analysis ◽

Model Based

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CORR Insights®: Is Model-based Radiostereometric Analysis Suitable for Clinical Trials of a Cementless Tapered Wedge Femoral Stem?

Clinical Orthopaedics and Related Research ◽

10.1007/s11999-016-5016-8 ◽

2016 ◽

Vol 474 (10) ◽

pp. 2254-2256

Author(s):

Benjamin Kendrick

Keyword(s):

Clinical Trials ◽

Femoral Stem ◽

Radiostereometric Analysis ◽

Model Based

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Radiostereometric analysis using clinical radiographic views: Validation with model-based radiostereometric analysis for the knee

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1177/0954411918785662 ◽

2018 ◽

Vol 232 (8) ◽

pp. 759-767

Author(s):

Xunhua Yuan ◽

Jordan S Broberg ◽

Douglas DR Naudie ◽

David W Holdsworth ◽

Matthew G Teeter

Keyword(s):

Standard Deviation ◽

Degrees Of Freedom ◽

Computed Radiography ◽

Radiostereometric Analysis ◽

Patient Registries ◽

Model Based ◽

High Measurement ◽

Repeatability Limit ◽

6 Degrees Of Freedom ◽

Analysis Environment

Radiostereometric analysis is a sophisticated radiographic technique with high measurement accuracy. In order to improve the accessibility of radiostereometric analysis for clinical use, a modified radiostereometric analysis procedure has been previously proposed that enables clinical radiographic views to be used for radiostereometric analysis. It has been successfully validated for its application to the hip wear study with the conventional bead–based radiostereometric analysis environment using computed radiography. In this study, we describe the implementation and validation of this technique for the knee study with the model-based radiostereometric analysis environment using digital radiography. A knee-joint phantom with 6 degrees of freedom was examined, and the bias and repeatability/reproducibility of the modified radiostereometric analysis approach were investigated following the newly updated ASTM recommendations. The bias parameters (mean ± 95% confidence interval) ranged from 0.008 ± 0.003 mm to 0.027 ± 0.006 mm for translation and from 0.014° ± 0.007° to 0.040° ± 0.020° for rotation. The repeatability standard deviation ranged from 0.004 to 0.020 mm for translation and from 0.005° to 0.015° for rotation. The 95% repeatability limit ranged from 0.011 to 0.055 mm for translation and from 0.014° to 0.041° for rotation. The reproducibility standard deviation ranged from 0.004 to 0.023 mm for translation and from 0.006° to 0.040° for rotation. The 95% reproducibility limit ranged from 0.012 to 0.063 mm for translation and from 0.016° to 0.112° for rotation. The modified procedure allows routine clinical radiographs to be used for radiostereometric analysis, which provides the possibility of adding quantitative measurements to current patient registries.

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