Diagnostic Accuracy of Subligamentous Spread in Magnetic Resonance Imaging
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Abstract
Objective: To evaluate the diagnostic value of subligamentous spread in the spinal tuberculosis.
Methods: Retrospective review of spinal magnetic resonance images was performed to evaluate the subligamentous spreading in 84 patients. The differentiation of subligamentous spreading in group of spinal tuberculosis and spinal metastasis were analyzed.
Result: There was statistically significant difference (p-value < 0.05) by univariate and multivariate analyses in parameters of location of the spinal involvement and maximum thickness of subligamentous spread between the groups of spinal TB and spinal metastasis. The presence of subligamentous spread and number of level involved had statistically significant difference by univariate analysis. Each millimeter of increased maximum thickness of subligamentous spread increased the probability of spinal TB about 1.36 times. The sensitivity, specificity, accuracy, positive predictive value and negative predictive value are 78.38%, 59.57%, 67.86%, 60.42%, and 77.78%, respectively.
Conclusions: There was statistically significant difference in the presence of subligamentous spread, number of level involved, maximum thickness, and location of spinal involvement between the groups of spinal tuberculosis and spinal metastasis. Increased maximum thickness of subligamentous spread increases the probability of spinal tuberculosis.
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