Abstract
Our aim was to characterise and classify permanent structural changes in the tectorial and posterior atlanto-occipital membranes several years after a whiplash injury, and to evaluate the reliability of our classification. We obtained sagittal proton density-weighted images of the craniovertebral junction of 92 whiplash-injured and 30 uninjured individuals. Structural abnormalities in the two membranes were classified as grades 1–3 independently by three radiologists blinded for clinical information. Grading criteria were based on reduced tectorial membrane thickness, and elongation or rupture of the posterior atlanto-occipital membrane/dura mater complex. The same images were reassessed 4 months later. Image quality was graded good in 104 cases, slightly reduced in 13 and unsatisfactory in five. Of 117 tectorial membranes 31 (26.5%) showed grade 2 or 3 lesions, in the uninjured group none were grade 3 and only three were grade 2. Pair-wise interobserver agreement (weighted kappa) was moderate (0.47–0.50), while the intraobserver agreement was moderate to good (0.51–0.70). Of 117 posterior atlanto-occipital membranes 20 (17.1%) had grade 2 or 3 lesions; there was no grade 3 and only one grade 2 lesion in the uninjured group. Inter- and intraobserver agreement was good (0.61–0.74 and 0.65–0.86, respectively). Reduced image quality was the main reason for disagreement, but partial thinning and lateral tapering, as normal tectorial membrane variations, created difficulties in some cases. This study strongly indicates that whiplash trauma can damage the tectorial and posterior atlanto-occipital membranes; this can be shown on high-resolution MRI. Better knowledge of normal anatomical variations and improved image quality should increase the reliability of lesion classification.
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Acknowledgements
We gratefully acknowledge Grethe Albrektsen PhD, Section of Medical Statistics, for statistical calculations and helpful suggestions; Leif Arve Abildgaard RT, Department of Radiology, for configuring the MRI sequences and Joost Gravendeel MD, Department of Radiology, for technical support with the illustrations.
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Krakenes, J., Kaale, B.R., Moen, G. et al. MRI of the tectorial and posterior atlanto-occipital membranes in the late stage of whiplash injury. Neuroradiology 45, 585–591 (2003). https://doi.org/10.1007/s00234-003-1036-7
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DOI: https://doi.org/10.1007/s00234-003-1036-7