Combination of a model-deformation method and a positional MRI to quantify the effects of posture on the anatomical structures of the trunk

Lafon, Yoann; Smith, Francis W.; Beillas, Philippe

doi:10.1016/j.jbiomech.2010.01.013

Cited by 17 publications

(13 citation statements)

References 53 publications

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“…This is the main limitation of this study: CT-scans were performed in a lying position, together with the unknown respiratory phase during acquisition. These conditions require a careful interpretation of the angular parameters of ribs in frontal and sagittal planes, as the effect of the posture on the thoracic structures (supine versus upright versus seated) has already been underlined [2,17]. Similarly, for the youngest children, The sternum is a structure that gradually ossifies.…”

Section: Discussionmentioning

confidence: 99%

Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood

Sandoz

Badina

Laporte

et al. 2013

Med Biol Eng Comput

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. CT-scans of 48 children, aged four months to 15 years. The geometry of the sternum was detailed 40 and nine parameters were used to describe the ribs and rib cages. A "costal index" was defined as 41 the ratio between cartilage length and whole rib length to evaluate the cartilage ratio for each rib 42 level. For all children, the costal index decreased from rib level one to three and increased from 43 level three to seven. For all levels, the cartilage accounted for 45 to 60% of the rib length, and was 44 longer for the first years of life. The mean costal index decreased by 21% for subjects over three 45 years old compared to those under three (p<10 -4 ). The volume of the sternebrae was found to be 46 highly age dependent. Such data could be useful to define the standard geometry of the paediatric 47 thorax and help to detect clinical abnormalities. 48

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Section: Discussionmentioning

confidence: 99%

Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood

Sandoz

Badina

Laporte

et al. 2013

Med Biol Eng Comput

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“…The stage of the respiratory cycle at which the CT scan was taken may be less controlled in the pediatric subjects who were too young to understand and follow the scanning protocol. Spinal curvature, rib angles, and rib coverage for thoracic and abdominal organs are also influenced by posture (Beillas et al 2009;Lafon et al 2010;Hayes et al 2013). Due to postural influences on the location and orientation of the ribs, the morphology characterized from supine scans in this study may be different for seated and standing postures.…”

Section: Limitationsmentioning

confidence: 91%

Morphometric analysis of variation in the ribs with age and sex

2014

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Rib cage morphology changes with age and sex are expected to affect thoracic injury mechanisms and tolerance, particularly for vulnerable populations such as pediatrics and the elderly. The size and shape variation of the external geometry of the ribs was characterized for males and females aged 0-100 years. Computed tomography (CT) scans from 339 subjects were analyzed to collect between 2700 and 10 400 homologous landmarks from each rib. Rib landmarks were analyzed using the geometric morphometric technique known as Procrustes superimposition. Age-and sex-specific functions of 3D rib morphology were produced representing the combined size and shape variation and the isolated shape variation. Statistically significant changes in the size and shape variation (P < 0.0001) and shape variation (P < 0.0053) of all 24 ribs were found to occur with age in males and females. Rib geometry, location, and orientation varied according to the rib level. From birth through adolescence, the rib cage experienced an increase in size, a decrease in thoracic kyphosis, and inferior rotation of the ribs relative to the spine within the sagittal plane. From young adulthood into elderly age, the rib cage experienced increased thoracic kyphosis and superior rotation of the ribs relative to the spine within the sagittal plane. The increased roundedness of the rib cage and horizontal angling of the ribs relative to the spine with age influences the biomechanical response of the thorax. With the plane of the rib oriented more horizontally, loading applied in the anterior-posterior direction will result in increased deformation within the plane of the rib and an increased risk for rib fractures. Thus, morphological changes may be a contributing factor to the increased incidence of rib fractures in the elderly. The morphological functions derived in this study capture substantially more information on thoracic skeleton morphology variation with age and sex than is currently available in the literature. The developed models of rib cage anatomy can be used to study age and sex variations in thoracic injury patterns due to motor vehicle crashes or falls, and clinically relevant changes due to chronic obstructive pulmonary disease or other diseases evidenced by structural and anatomic changes to the chest.

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“…Recently, Beillas et al [20] and Lafon et al [21] examined morphology and location changes of thoracic and abdominal bones and soft tissues using one image modality, Upright Magnetic Resonance Imaging (uMRI). Bony landmarks, the kidneys, liver, spleen, the abdominal cavity, and the thoracic cavity were all examined in four different postures: standing, supine, seated, and forward flexed.…”

Section: Introductionmentioning

confidence: 99%

“…When comparing these three postures to the supine posture, the position of solid organs changed by as much as 40 mm. Additionally, studies concluded that abdominal geometry should be corrected for organ movement when using the supine position for finite element modeling [20, 21]. …”

Section: Introductionmentioning

confidence: 99%

Comparison of Organ Location, Morphology, and Rib Coverage of a Midsized Male in the Supine and Seated Positions

Hayes

Gayzik

Moreno

et al. 2013

Computational and Mathematical Methods in Medicine

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The location and morphology of abdominal organs due to postural changes have implications in the prediction of trauma via computational models. The purpose of this study is to use data from a multimodality image set to devise a method for examining changes in organ location, morphology, and rib coverage from the supine to seated postures. Medical images of a male volunteer (78.6 ± 0.77 kg, 175 cm) in three modalities (Computed Tomography, Magnetic Resonance Imaging (MRI), and Upright MRI) were used. Through image segmentation and registration, an analysis between organs in each posture was conducted. For the organs analyzed (liver, spleen, and kidneys), location was found to vary between postures. Increases in rib coverage from the supine to seated posture were observed for the liver, with a 9.6% increase in a lateral projection and a 4.6% increase in a frontal projection. Rib coverage area was found to increase 11.7% for the spleen. Morphological changes in the organs were also observed. The liver expanded 7.8% cranially and compressed 3.4% and 5.2% in the anterior-posterior and medial-lateral directions, respectively. Similar trends were observed in the spleen and kidneys. These findings indicate that the posture of the subject has implications in computational human body model development.

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Combination of a model-deformation method and a positional MRI to quantify the effects of posture on the anatomical structures of the trunk

Cited by 17 publications

References 53 publications

Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood

Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood

Morphometric analysis of variation in the ribs with age and sex

Comparison of Organ Location, Morphology, and Rib Coverage of a Midsized Male in the Supine and Seated Positions

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