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Previous issue date: 2012-03-01 / Objectives: To evaluate three-dimensional (3D) measurements of the lower extremity using a biplanar low-dose X-ray device in children and adolescents. Methods: In the first part of this study, 3D measurements of eight dried bones were analyzed by a biplanar low-dose X-ray device(LDX) using stereoscopic software and compared with 3D Computed Tomography (CT). In the second part, 47 lower limbs of children and adolescents were studied using LDX two-dimensional (2D) and 3D measurements. Both parts evaluated: femoral and tibial lengths, femoral and tibial mechanical angles, frontal and lateral knee angulations, and the femoral neck-shaft angle. Results: The 3D specimen comparison between LDX and CT measurements showed no significant differences: femoral length (p: 0.069), tibial length(p: 0.059), femoral mechanical angle (p: 0.475), tibial mechanical angle (p: 0.067), frontal knee angulation (p: 0.198), lateral knee angulation (p: 0.646) and femoral neck-shaft angle(p:0.068). The comparison between LDX 2D and 3D measurements in patients showed significant differences in tibial length (p: 0.003), femoral mechanical angle (p<0.001) and femoral neck-shaft angle (p: 0.001); other parameters were unremarkable. Conclusions: The 3D LDX system presented accurate measurements compared with 3D CT. Differences between LDX 2D and 3D measurements were noted in the femoral mechanical angle, femoral neck-shaft angle and tibial length. Moderate to good interobserver agreement for the 3D LDX measurements were found. / Objetivos: Avaliar as medidas tridimensionais(3D) das extremidades inferiores utilizando um sistema biplanar de baixa dose de radia??o (LDX) em crian?as e adolescentes. M?todos: Na primeira parte do estudo, medidas 3D de oito esp?cimes foram analisadas pelo LDX utilizando um programa estereosc?pico e comparadas com medidas 3D da tomografia computadorizada (TC). Na segunda parte, 47 membros inferiores de crian?as e adolescentes foram estudados utilizando medidas bi e tridimensionais. Foram avaliados: os comprimentos femoral e tibial, os ?ngulos mec?nicos femoral e tibial, as angula??es frontal e lateral do joelho e o ?ngulo c?rvico-diafis?rio. Resultados: A compara??o entre as medidas 3D pelo LDX e a TC dos esp?cimes n?o mostraram diferen?as significativas:comprimento femoral (p: 0,069), comprimento tibial (p:0,059), ?ngulo femoral mec?nico (p: 0,475), ?ngulo tibial mec?nico (p: 0,067), angula??o frontal do joelho (p: 0,198), angula??o lateral do joelho (p: 0,646) e ?ngulo c?rvico-diafis?rio (p: 0,068). A compara??o entre as medidas bi e tridimensionais nos pacientes mostraram diferen?as significativas no comprimento tibial (p: 0,003), ?ngulo femoral mec?nico (p<0.001) e ?ngulo c?rvico-diafis?rio (p: 0,001); os outros par?metros n?o demonstraram altera??es significativas. Conclus?es: As medidas tridimensionais do LDX apresentam boa acur?cia quando comparadas com as medidas tridimensionais da TC. Diferen?as entre as medidas bi e tridimensionais do LDX foram observadas no comprimento tibial, ?ngulo femoral mec?nico e ?ngulo c?rvico-diafis?rio. Moderadas e boas concord?ncias interobservadores foram encontradas para as medidas tridimensionais do LDX.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1385 |
| Date | 01 March 2012 |
| Creators | Gheno, Ramon |
| Contributors | Baldisserotto, Matteo |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Medicina/Pediatria e Sa?de da Crian?a, PUCRS, BR, Faculdade de Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 3098206005268432148, 500, 600, -8624664729441623247 |
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