Med Biol Eng Comput - Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood.

Tópicos

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Resumo

Better understanding of the effects of growth on children's bones and cartilage is necessary for clinical and biomechanical purposes. The aim of this study is to define the 3D geometry of children's rib cages: including sternum, ribs and costal cartilage. Three-dimensional reconstructions of 960 ribs, 518 costal cartilages and 113 sternebrae were performed on thoracic CT scans of 48 children, aged 4 months to 15 years. The geometry of the sternum was detailed and nine parameters were used to describe the ribs and rib cages. A "costal index" was defined as the ratio between cartilage length and whole rib length to evaluate the cartilage ratio for each rib level. For all children, the costal index decreased from rib level 1 to 3 and increased from level 3 to 7. For all levels, the cartilage accounted for 45-60 % of the rib length, and was longer for the first years of life. The mean costal index decreased by 21 % for subjects over 3-year old compared to those under three (p < 10(-4)). The volume of the sternebrae was found to be highly age dependent. Such data could be useful to define the standard geometry of the pediatric thorax and help to detect clinical abnormalities.

Resumo Limpo

better understand effect growth children bone cartilag necessari clinic biomechan purpos aim studi defin d geometri children rib cage includ sternum rib costal cartilag threedimension reconstruct rib costal cartilag sternebra perform thorac ct scan children age month year geometri sternum detail nine paramet use describ rib rib cage costal index defin ratio cartilag length whole rib length evalu cartilag ratio rib level children costal index decreas rib level increas level level cartilag account rib length longer first year life mean costal index decreas subject year old compar three p volum sternebra found high age depend data use defin standard geometri pediatr thorax help detect clinic abnorm

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