Marker Configuration Model-Based Roentgen Fluoroscopic Analysis

Garling, E.H.; Kaptein, Bart L; Geleijns, Koos; Nelissen, Rob G H H; Valstar, Edward R.

doi:10.1016/j.jbiomech.2004.04.026

Cited by 64 publications

(61 citation statements)

References 28 publications

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“…Radiostereometric analysis (RSA) may be a way forward. RSA involves implantation of tantalum markers to analyze implant and joint micromotion and has been shown to be accurate [4,9,12,16,21]. Further work is needed to evaluate this technology for use in TDR ROM measurements.…”

Section: Discussionmentioning

confidence: 99%

Radiographic total disc replacement angle measurement accuracy using the Oxford Cobbometer: precision and bias

et al. 2008

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Total disc replacement (TDR) clinical success has been reported to be related to the residual motion of the operated level. Thus, accurate measurement of TDR range of motion (ROM) is of utmost importance. One commonly used tool in measuring ROM is the Oxford Cobbometer. Little is known however on its accuracy (precision and bias) in measuring TDR angles. The aim of this study was to assess the ability of the Cobbometer to accurately measure radiographic TDR angles. An anatomically accurate synthetic L4-L5 motion segment was instrumented with a CHARITE artificial disc. The TDR angle and anatomical position between L4 and L5 was fixed to prohibit motion while the motion segment was radiographically imaged in various degrees of rotation and elevation, representing a sample of possible patient placement positions. An experienced observer made ten readings of the TDR angle using the Cobbometer at each different position. The Cobbometer readings were analyzed to determine measurement accuracy at each position. Furthermore, analysis of variance was used to study rotation and elevation of the motion segment as treatment factors. Cobbometer TDR angle measurements were most accurate (highest precision and lowest bias) at the centered position (95.5%), which placed the TDR directly inline with the x-ray beam source without any rotation. In contrast, the lowest accuracy (75.2%) was observed in the most rotated and off-centered view. A difference as high as 4°between readings at any individual position, and as high as 6°between all the positions was observed. Furthermore, the Cobbometer was unable to detect the expected trend in TDR angle projection with changing position. Although the Cobbometer has been reported to be reliable in different clinical applications, it lacks the needed accuracy to measure TDR angles and ROM. More accurate ROM measurement methods need to be developed to help surgeons and researchers assess radiological success of TDRs.

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Section: Discussionmentioning

confidence: 99%

Radiographic total disc replacement angle measurement accuracy using the Oxford Cobbometer: precision and bias

et al. 2008

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“…The algorithm used a 9th-order polynomial correction filter (Garling et al, 2005) integrated in the fluoroscopy module of the Model-based RSA software (Medis Specials BV, Leiden, The Netherlands).…”

Section: Spatial Image Distortion Correctionmentioning

confidence: 99%

“…The inner optimization loop determined the pose of the CUBE by minimizing the distance between the CUBE markers and their corresponding projection lines for a given focus position (Garling et al, 2005). The outer optimization loop searched for the focus position by minimizing the matching error from the inner optimization loop.…”

Section: Focus Position Calculationmentioning

confidence: 99%

A comparison of calibration methods for stereo fluoroscopic imaging systems

Kaptein

Shelburne

Torry

et al. 2011

Journal of Biomechanics

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“…Model based fluoroscopic analysis is a highly accurate technique to study axial rotation in total knee arthroplasty (TKA), [1,2] but is limited to relatively simple tasks that can be performed within the small measurement volume of the fluoroscope. Optoelectronic gait analysis does not suffer from this limitation and is technically equally accurate.…”

Section: Introductionmentioning

confidence: 99%