The Role of Cartridge-Based Nucleic Acid Amplification Test (CBNAAT), Line Probe Assay (LPA), Liquid Culture, Acid-Fast Bacilli (AFB) Smear and Histopathology in the Diagnosis of Osteoarticular Tuberculosis.

Indian Journal of Orthopaedics
S AbhimanyuRohit Sarin

Abstract

There is a paucity of data on the role of molecular methods in the diagnosis of osteoarticular tuberculosis. The present study was conducted to define the role of molecular (CBNAAT, LPA), phenotypic (AFB smear and culture) and histopathological evaluation in the diagnosis of osteoarticular TB. Seventy-seven consecutive cases of osteoarticular tuberculosis were grouped into presumptive TB cases (group A) and presumptive drug-resistant cases (group B). Tissue samples obtained were submitted for CBNAAT, LPA, AFB smear, liquid culture and histological examinations. The diagnostic accuracy of each test was reported against histologically diagnosed cases and in all tests in tandem. Group A and group B had 65 and 12 cases, respectively. The diagnostic accuracy for tuberculosis was 84.62% by CBNAAT, 70.77% by LPA, 86.15% by molecular tests (combined), 47.69% by AFB smear, 50.77% by liquid culture and 87.69% by histology in group A, and 91.67% for CBNAAT, 83.33% for LPA, 91.67% for molecular tests (combined), 25% for AFB smear, 16.67% for liquid culture and 83.33% for histology in group B. The drug resistance detection rate was 4.62% on CBNAAT, 3.08% on LPA, 6.15% on molecular tests (combined) and 1.54% on DST in group A, while it was 3...Continue Reading

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