Geometric morphometrics of adolescent idiopathic scoliosis: a prospective observational study

González-Ruiz, José María; Pérez-Núñez, María Isabel; García-Alfaro, Ma Dolores; Bastir, Markus

doi:10.1007/s00586-020-06583-5

Cited by 11 publications

(21 citation statements)

References 24 publications

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“…Torso surface scans of all subjects were done in a standing position with the hands slightly raised over the head following the protocol of González-Ruiz et al [7]. Then, scans were processed (global registration and fast fusion) in ArtecStudio to obtain 3D meshes at the baseline time and six months after the first scanning process.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…Using the three-dimensional landmarks template described in González-Ruiz et al [7], we digitized the whole sample twice in Viewbox and subsequently extracted all coordinates from landmarks after the sliding process was done. Two datasets with the coordinates of the first and the second measurements were prepared for further analyses of GMM.…”

Section: Geometric Morphometricsmentioning

confidence: 99%

“…This research line remained latent until the recent appearance of new methodologies applied to the study of the asymmetric properties of the human torso. Specifically, geometric morphometrics (GMM) has been used for decades in other fields of biological research [6] and has recently brought new quantitative and qualitative variables to the study of idiopathic scoliosis [7]. Thus, higher levels of fluctuating asymmetry have been evidenced in other clinical conditions different from scoliosis in the form of positive correlation between asymmetries and symptoms [8].…”

Section: Introductionmentioning

confidence: 99%

“…Finally, qualitative variables are basic for the biological comprehension and description of the AIS condition regarding the multiple factors acting all around [7,15]. Particularly, the GMM offers a strong arsenal of visualization tools that clinicians may benefit from.…”

Section: Introductionmentioning

confidence: 99%

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Investigating Human Torso Asymmetries: An Observational Longitudinal Study of Fluctuating and Directional Asymmetry in the Scoliotic Torso

et al. 2021

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The presence of directional and fluctuating asymmetry in adolescent idiopathic scoliosis has not been deeply studied. We aimed to test the presence of both in a scoliosis group and a control group. 24 patients with adolescent idiopathic scoliosis and 24 control subjects were subjected to geometric morphometrics analyses to address our main hypotheses and to make qualitative visualizations of the 3D shape changes in patients with scoliosis. Our results support the hypothesis that both asymmetric traits are present in the scoliosis and control groups, but to a greater degree in patients. A qualitative visualization tool that allows us to measure the impact that directional and fluctuating asymmetry have on the 3D shape of our patients has been developed. Adolescent idiopathic scoliosis is the result of developmental instabilities during growth and the visualization of the 3D shape changes in response to both asymmetric variables has shown different morphological behaviors. Measuring these variables is important, as they can prevent the localization and deformation that is expected to occur during the course of scoliosis in every individual patient and therefore acts as a key clinical finding that may be used in the prognosis of the condition.

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Section: Data Acquisitionmentioning

confidence: 99%

Section: Geometric Morphometricsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigating Human Torso Asymmetries: An Observational Longitudinal Study of Fluctuating and Directional Asymmetry in the Scoliotic Torso

et al. 2021

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“…Thus, several studies have so far addressed the implication of specific elements of trunk morphology in isolation on locomotor performance. This study explores the relationship between entire 3D trunk shape and running performance based on virtual and geometric morphometric methods 51 , 52 . In the light of the functional anatomical evidence reviewed above, we address the hypothesis that trunks with an antero-posteriorly flat ribcage, a medio-laterally narrow pelvis and a lower lumbar lordosis are associated to a better running performance.…”

Section: Introductionmentioning

confidence: 99%

Variation in human 3D trunk shape and its functional implications in hominin evolution

Bastir

Ruiz

Rueda

et al. 2022

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This study investigates the contribution of external trunk morphology and posture to running performance in an evolutionary framework. It has been proposed that the evolution from primitive to derived features of torso shape involved changes from a mediolaterally wider into a narrower, and antero-posteriorly deeper into a shallower, more lightly built external trunk configuration, possibly in relation to habitat-related changes in locomotor and running behaviour. In this context we produced experimental data to address the hypothesis that medio-laterally narrow and antero-posteriorly shallow torso morphologies favour endurance running capacities. We used 3D geometric morphometrics to relate external 3D trunk shape of trained, young male volunteers (N = 27) to variation in running velocities during different workloads determined at 45–50%, 70% and 85% of heart rate reserve (HRR) and maximum velocity. Below 85% HRR no relationship existed between torso shape and running velocity. However, at 85% HRR and, more clearly, at maximum velocity, we found highly statistically significant relations between external torso shape and running performance. Among all trained subjects those with a relatively narrow, flat torso, a small thoracic kyphosis and a more pronounced lumbar lordosis achieved significantly higher running velocities. These results support the hypothesis that external trunk morphology relates to running performance. Low thoracic kyphosis with a flatter ribcage may affect positively respiratory biomechanics, while increased lordosis affects trunk posture and may be beneficial for lower limb biomechanics related to leg return. Assuming that running workload at 45–50% HRR occurs within aerobic metabolism, our results may imply that external torso shape is unrelated to the evolution of endurance running performance.

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Vitamin D and adolescent idiopathic scoliosis, should we stop the hype? A cross-sectional observational prospective study based on a geometric morphometrics approach

et al. 2023

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Purpose There is strong evidence supporting the presence of fluctuating asymmetry (FA) in Adolescents with Idiopathic Scoliosis (AIS). Additionally, recent research investigating the relationship between vitamin D and AIS found a relation between them. We hypothesize a negative correlation between FA and vitamin D. Methods We performed a surface scan of the torso of 53 AIS patients, a blood test to measure vitamin D and the radiographic Cobb angle. A correlation analysis between vitamin D and FA was carried out to test our hypothesis, and a regression of vitamin D on 3D shape was performed to observe shape differences between the vitamin D deficiency and insufficiency groups. Results There was no correlation between vitamin D and FA. We found a strong negative correlation between vitamin D and the Cobb angle only in the premenarche group (n = 7; r = − 0.92). Differences in shape were observed between the deficiency and insufficiency groups, and that differences were related to the width of the torso, but not the rotation or lateral flexion. Conclusions Our results do not support the massive screening of vitamin D in AIS. Shape analysis revealed differences between the shape of the deficiency and insufficiency groups related to robustness. However, this finding had no relation with the scoliosis characteristics, it just reflected different body composition, and its importance should be explored in future.

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Geometric morphometrics of adolescent idiopathic scoliosis: a prospective observational study

Cited by 11 publications

References 24 publications

Investigating Human Torso Asymmetries: An Observational Longitudinal Study of Fluctuating and Directional Asymmetry in the Scoliotic Torso

Investigating Human Torso Asymmetries: An Observational Longitudinal Study of Fluctuating and Directional Asymmetry in the Scoliotic Torso

Variation in human 3D trunk shape and its functional implications in hominin evolution

Vitamin D and adolescent idiopathic scoliosis, should we stop the hype? A cross-sectional observational prospective study based on a geometric morphometrics approach

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