Predictive Value of Vertebral Bone Destruction Classification Based on Computed Tomography in Diagnosing on Adult Spinal Tuberculosis

Abstract

Although magnetic resonance imaging (MRI) is well established for evaluation of spinal tuberculosis (TB), the importance of computed tomography (CT) should not be overlooked. The purpose of this study was to determine the characteristics of spinal TB and the relationship between spinal TB and the bone lesion pattern seen on three-dimensional CT images. One hundred and sixty-one subjects were divided into a TB-positive group and a TB-negative group based on laboratory (X-pert MTB/RIF) results and then subdivided further according to whether the bone lesion pattern seen on three-dimensional CT images was fragmentary, osteolytic, sclerotic, or had no evidence of bone destruction. The diagnostic value of the bone lesion pattern was compared between the TB-positive and TB-negative groups. Ninety-nine of the 161 patients were TB-positive and 62 were TB-negative. Fifty-six (34.8%) of the 161 patients had fragmentary/osteolytic lesions, seventy-four (45.9%) had absolute osteolytic lesions, 13 (8.1%) had osteosclerotic lesions, and 18 (11.2%) had no evidence of bone destruction. The fragmentary/osteolytic lesion pattern was strongly predictive of spinal TB (odds ratio 3.33), and when combined with three MRI findings (thin abscess wall, more than half of the vertebral body destroyed, and subligamentous spread) had an even stronger diagnostic value (odds ratio 15.58). The absolute osteolytic pattern was the most common of the bone lesion patterns. The fragmentary/osteolytic pattern is highly suggestive of spinal TB, especially when combined with MRI findings of a thin abscess wall, destruction of more than half of the vertebral body, and subligamentous spread.