Person: Yurac, Ratko
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Yurac
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Ratko
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Publication Utility of opportunistic CT Hounsfield Units determined bone quality in chilean women(2025) Yurac, Ratko; Mardones, Paula; Núñez, Marilaura; Bravo, Oscar; Quinteros, Guísela; Ariztía, Antonio; Nazar, Catalina; Marré, AndreaObjective: To describe the correlation between Hounsfield Units in opportunistic computed tomography (CT scan) and T-score measured by dual energy X-ray absorptiometry (DXA) in the Chilean population. Method: Female patients over 50 years old with CT scan and DXA performed within 6 months. Hounsfield units (HU) were measured by circular regions-of-interest placed on axial slice image of the L1 vertebral body in the CT scan. T-score was obtained through DXA scan in L1-L4 vertebrae. Results: 144 female patients were included with a mean age in years of 68.39 ± 8.75. A moderate correlation was found between T-score and HU (Pearson coefficient of 0.6, p < 0.001). The mean values of HU differ significantly between the groups of Osteoporosis (OP) (89.46 ± 20.20), Osteopenia (110.87 ± 30.74) and normal bone mineral density (154.53 ± 38.90) (p < 0.01). The area under curve for diagnostic capacity was 0.81 (95% CI 0.72-0.9). The HU thresholds for the diagnosis of OP were 101 (sensitivity 75%, specificity 75%). Conclusion: Opportunistic CT scan is a useful tool in Chilean population to perform a screening for OP.Publication AO Spine-DGOU Osteoporotic Fracture Classification System: Internal Validation by the AO Spine Knowledge Forum Trauma(2024) Scherer, Julian; Joaquim, Andrei; Vaccaro, Alex; Kanna, Rishi; El-Sharkawi, Mohammad; Takahata, Masahiko; Aly, Mohamed; Camino, Gaston; Spiegl, Ulrich; Oner, Cumhur; Canseco, Jose; Yurac, Ratko; Benneker, Lorin; Popescu, Eugen; Bransford, Richard; Chhabra, Harvinder; Kandziora, Frank; Neva, Marko; Schnake, KlausStudy design: Cross-sectional survey. Objectives: Injury classifications are important tools to identify fracture patterns, guide treatment-decisions and aid to identify optimal treatment plans. The AO Spine-DGOU Osteoporotic Fracture (OF) classification system was developed, and the aim of this study was to assess the reliability of this new classification system. Methods: 23 Members of the AO Spine Knowledge Forum Trauma participated in the validation process. Participants were asked to rate 33 cases according to the OF classification at 2 time points, 4 weeks apart (assessment 1 and 2). The kappa statistic (κ) was calculated to assess inter-observer reliability and intra-rater reproducibility. The gold master key for each case was determined by approval of at least 5 out of 7 members of the DGOU. Results: A total of 1386 ratings (21 raters) were performed. The overall inter-rater agreement was moderate with a combined kappa statistic for the OF classification of 0.496 in assessment 1 and 0.482 in assessment 2. The combined percentage of correct ratings (compared to gold-standard) in assessment 1 was 71.4% and 67.4% in assessment 2. The average intra-rater reproducibility was substantial (κ = 0.74, median 0.76, range 0.55 to 1.00, SD 0.13) for the assessed fracture types. Conclusions: The assessed overall inter-rater reliability was moderate and substantial in some instances. The average intra-rater reproducibility is substantial. It seems that appropriate training of the classification system can enhance inter- and intra-rater reliability.