Inter-observer agreement in the identification of the two bundles of the anterior cruciate ligament using magnetic resonance imaging |
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Authors: | M Montoy T Euvrard B Moyen P Roy J C Rollier F Cotton |
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Institution: | Laboratoire d'Anatomie de Rockefeller, Université Claude Bernard Lyon 1, 69312, Lyon Cedex 08, France. |
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Abstract: | Background Magnetic resonance imaging has become the method of choice to diagnose meniscal and ligament lesions of the knee. New approaches
to the surgical treatment of partial anterior cruciate ligament tears led us to try to distinguish the two bundles of that
ligament with MRI and to evaluate inter-observer agreement in different viewing planes.
Methods Images of 50 right and 50 left ligament-intact knees were examined in the coronal and axial viewing planes. Each sequence
was independently read by a radiologist and a medical student to note, in each viewing plane, the number of images in which
the two-bundle structure of the ligament was clearly seen. Cohen’s Kappa coefficients were used to determine inter-observer
agreements.
Results The percentage of sequences in which the two bundles were distinguished by the radiologist and the student on one image at
least were 82 versus 73% in the coronal plane and 90 versus 93% in the axial plane, respectively. The average number of successive
images with clear bundles was higher in the axial (2.7 vs. 1.7) than in the coronal plane (2.2 vs. 1). There was a poor inter-observer
agreement in the coronal plane (k = 0.176) but an intermediate agreement in the axial plane (k = 0.385 or 0.522 depending on number pooling).
Conclusions The axial viewing plane seems more favourable to distinguish the two bundles of the anterior cruciate ligament with the best
possible reproducibility. An oblique-axial plane is deemed to insure a clearer diagnosis of partial tears. |
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Keywords: | Anterior cruciate ligament Magnetic resonance imaging Knee Sports medicine |
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