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- W2090875299 abstract "To evaluate the performance of conventional radiographs (CR) for the assessment of pedicle screws in comparison with CT including MPR.Comparison of CR and CT for the evaluation of screw length, extracorporal perforation (grade A: 0 - 2 mm, B: 3 - 4 mm, C: 5 - 6 mm, D: > 6 mm, relevant: grade C and D), screw contact/loosening, and subjective image quality (1: excellent to 4: non-diagnostic). The sensitivity (SE), specificity (SP), positive (PPV) and negative predictive value (NPV), and overall accuracy (OA) were calculated with 4x4 contingency tables. The subjective image quality was evaluated using the Wilcoxon test (p < 0.05).411 screws were evaluated. The relevant medial perforation was diagnosed with CR/CT in 53(13 %)/ 11(3 %) screws, while the relevant lateral perforation was found in 3(1 %)/ 43(11 %) screws. Pedicle screw contact was diagnosed by CR/CT in 10(2 %)/ 18(4 %) cases and incorrect length was confirmed in 80(20 %)/ 90(22 %) screws. A diagnosis of loosening was established in 10(2 %) screws by CR and in 7(2 %) screws by MDCT. In summary, CR demonstrated SE, SP, PPV, NPV, and OA for the following variables: relevant medial perforation = 64 / 89 / 13 / 99 / 88 %, relevant lateral perforation = 4 / 99 / 67 / 90 / 90 %, screw contact = 11 / 98 / 20 / 96 / 94 %, incorrect screw length = 86 / 58 / 89 / 51 / 81 %, and screw loosening = 71 %/ 99 %/ 50 %/ 100 %/ 98 %. The subjective image quality of CR was significantly lower compared to CT (2.19 A + or - 0.84 and 1.11 A + or - 0.31; p < 0.001).CR evaluation of pedicle screws following dorsal instrumentation of the spine demonstrated an OA < or = 90 % for relevant medial and lateral perforation and for incorrect screw length compared to CT. Thus, reliable evaluation of pedicle screws based solely on CR does not seem feasible." @default.
- W2090875299 created "2016-06-24" @default.
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- W2090875299 date "2009-10-27" @default.
- W2090875299 modified "2023-09-27" @default.
- W2090875299 title "Lagebeurteilung transpedikulärer Schrauben nach dorsaler Spondylodese mittels konventioneller Röntgenaufnahmen: ein Vergleich zur Mehrzeilen-Computertomografie" @default.
- W2090875299 doi "https://doi.org/10.1055/s-0028-1109836" @default.
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