A new quasi-invariant parameter characterizing the postural alignment of young asymptomatic adults

Amabile, Célia; Pillet, Hélène; Lafage, Virginie; Barrey, Cédric; Vital, Jean-Marc; Skalli, Wafa

doi:10.1007/s00586-016-4552-y

Cited by 61 publications

(90 citation statements)

References 28 publications

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“…There exists a high degree of agreement between our research and the literature on X-ray-based normal sagittal spine morphology (a short review is found in S1 Table [71–74,87,89,91,94,96,100–103]) regarding the mean angle values obtained in our population by measuring the profile of spinous processes in a neutral standing upright posture with arms at the side. Due to changes in spinal profile induced by ageing [5] the data reported in S1 Table refer to populations with an age range similar to that analysed in the present study.…”

Section: Discussionsupporting

confidence: 77%

“…Normative data from X-Ray measurements for Thoracic Kyphosis span a range of 20°-70° thus presenting a high variability among the studies [51,71–74,86,87,89,91,94–97]. In one of the earliest studies on sagittal alignment, Stagnara et al [95] concluded that the “span of possible values of maximum kyphosis and lordosis in subjects with no spinal disease is considerable.…”

Section: Discussionmentioning

confidence: 99%

“…For this reason, the words “thoracic” and “lumbar” will be used with inverted commas in the remainder of this paper: as explained above, kyphosis and lordosis are not strictly limited to these anatomical regions. In addition, for a direct comparison with the X-Ray based Kypho-Lordotic angle values presented in the literature [71–74] the sagittal plane spine angle values have also been assessed for the most reported anatomical regions (T1—T12) as well as T4—T12 for kyphosis and T12—L5 for lordosis. After computation, a graphical report summarizes and represents the 3D full skeleton reconstruction and the related computed quantitative parameters (Fig 4).…”

Section: Methodsmentioning

confidence: 99%

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Normative 3D opto-electronic stereo-photogrammetric posture and spine morphology data in young healthy adult population

2017

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Design: Observational cross-sectional study. The current study aims to yield normative data: i.e., the physiological standard for 30 selected quantitative 3D parameters that accurately capture and describe a full-skeleton, upright-standing attitude. Specific and exclusive consideration was given to three distinct categories: postural, spine morphology and pelvic parameters. To capture such 3D parameters, the authors selected a non-ionising 3D opto-electronic stereo-photogrammetric approach. This required the identification and measurement of 27 body landmarks, each specifically tagged with a skin marker. As subjects for the measurement of these parameters, a cohort of 124 asymptomatic young adult volunteers was recruited. All parameters were identified and measured within this group. Postural and spine morphology data have been compared between genders. In this regard, only five statistically significant differences were found: pelvis width, pelvis torsion, the “lumbar” lordosis angle value, the lumbar curve length, and the T12-L5 anatomically-bound lumbar angle value. The “thoracic” kyphosis mean angle value was the same in both sexes and, even if, derived from skin markers placed on spinous processes it resulted in perfect agreement with the X-ray based literature. As regards lordosis, a direct comparison was more difficult because methods proposed in the literature differ as to the number and position of vertebrae under consideration, and their related angle values. However, when the L1 superior–L5 inferior end plate Cobb angle was considered, these results aligned strongly with the existing literature. Asymmetry was a standard postural-spinal feature for both sexes. Each subject presented some degree of leg length discrepancy (LLD) with μ = 9.37mm. This was associated with four factors: unbalanced posture and/or underfoot loads, spinal curvature in the frontal plane, and pelvis torsion. This led to the additional study of the effect of LLD equalisation influence on upright posture, relying on a sub-sample of 100 subjects (51 males, 49 females). As a result of the equalisation, about 82% of this sub-sample showed improvement in standing posture, mainly in the frontal plane; while in the sagittal plane less than 1/3 of the sub-sample showed evidence of change in spinal angles. A significant variation was found in relation to pelvis torsion: 46% of subjects showed improvement, 49% worsening. The method described in study presents several advantages: non-invasive aspect; relatively short time for a complete postural evaluation with many clinically useful 3D and 2D anatomical/biomechanical/clinical parameters; analysis of real neutral unconstrained upright standing posture.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Normative 3D opto-electronic stereo-photogrammetric posture and spine morphology data in young healthy adult population

2017

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“…We hypothesized that it may be the result of a pathological interaction between postural and ventilatory functions. Twelve patients with OSAS (4 women, age 53 years [51][52][53][54][55][56][57][58][59][60][61][62][63] (median [quartiles]), apnea hypopnea index 31/h [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]) were compared with 12 healthy matched controls. Low dose biplanar X-rays (EOS ® system) were acquired and personalized three-dimensional models of the spine and pelvis were reconstructed.…”

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confidence: 99%

Cervical Spine Hyperextension and Altered Posturo-Respiratory Coupling in Patients With Obstructive Sleep Apnea Syndrome

et al. 2020

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Keywords: obstructive sleep apnea syndrome, biplanar X-ray, personalized 3D models of the spine, posturorespiratory coupling, respiratory emergence, cervical spine hyperextension, head forward, hyperkyphosis Clavel et al. Altered Posturo-Respiratory Coupling in OSASConflict of Interest: VA reports personal fees from ADEP Assistance, personal fees from Resmed, personal fees from Nyxoah, outside the submitted work. TS reports personal fees from AstraZeneca, France, personal fees from Boerhinger Ingelheim, France, personal fees from GSK, France, personal fees and non-financial support from Novartis, France, personal fees from Lungpacer Inc.

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“…Maintaining spinal alignment in close proximity to the vertical is considered optimal to minimise postural muscle activity (Edmondston et al, 2011;Hasegawa et al, 2017;Schwab et al, 2006), optimize gaze (Amabile et al, 2016;Diebo et al, 2016;Duvalbeaupere et al, 1992;Hasegawa et al, 2017), and optimize shoulder function (Crawford and Jull 1993). As the largest component of the spine, the thoracic spine influences postural alignment and function of neighbouring structures, such as the scapulae, upper limbs, and neck.…”

Section: Introductionmentioning

confidence: 99%

Refining scapulothoracic kinematic measurement and characterising scapulothoracic resting posture in those with and without chronic non-specific neck pain

Bet-Or¹

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Neck pain is a common and recurrent condition affecting between 30 to 50% of adults in any given year. People experiencing neck pain commonly report difficulties in performing activities involving the upper extremity. Furthermore, clinical trials that have included exercises that target the shoulder girdle have shown beneficial effects in reducing neck pain. These observations are feasible based on the biomechanical dependence of the cervical spine and shoulder girdle, which includes common muscle attachments. However, to date there has been a paucity of studies investigating underlying movement disorders of the shoulder girdle in people with neck pain. This is in part due to the challenges of kinematic measurement in this region. The aim of this thesis is to contribute to the literature concerning the role of the shoulder girdle and thorax complex in neck pain from three perspectives. First, the thesis has further refined and informed measurement methods of shoulder girdle and thoracic kinematics (Studies 1-3). Secondly, the thesis further defined normative kinematics of the region with a focus on upright resting posture (Study 4). Thirdly, the thesis explored differences in shoulder girdle and thoracic resting posture in upright standing in those with and without neck pain (Study 5).Advancement in knowledge concerning normal and impaired function of the shoulder girdle has been hindered by challenges related to 3D motion capture of the shoulder girdle and thorax due to skin movement and the complexity of measuring multiple joints and axes of rotation. Therefore, Study1 focused on refining and validating an acromion marker cluster (AMC) method to track scapular movement with the intent of minimising skin movement error. Although the findings of Study 1 indicated that the refined AMC design did not appear to lessen skin movement error compared to previous designs, it was found to be of comparable accuracy (max RMSE 4.45°) and reliability to previous designs (within-session test-retest ICC 0.79-0.99) and appropriate for use in the subsequent thesis studies. In Study 2 the reliability and validity of the AMC method was further evaluated in its capacity to track the scapula at end range clavicular movements (protraction/retraction, elevation/depression). Establishing its measurement accuracy and reliability (max RMSE 6.6°) in these common directions of scapula motion was necessary as it had been previously unstudied. While Studies 1 and 2 focused on optimising the measurement of scapulothoracic kinematics by ensuring the scapula could be tracked accurately, Study 3 focused on refining the measurement of the relationship between the shoulder girdle and the underlying thorax. This study compared thoracic and shoulder girdle postural relationships expressed in the external reference frame to that expressed in the traditionally used ISB recommended thorax reference frame. Using these different frames of iii reference Study 3 also compared measures of thoracic inclination and thoracic curvature. The findings sho...

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A new quasi-invariant parameter characterizing the postural alignment of young asymptomatic adults

Cited by 61 publications

References 28 publications

Normative 3D opto-electronic stereo-photogrammetric posture and spine morphology data in young healthy adult population

Normative 3D opto-electronic stereo-photogrammetric posture and spine morphology data in young healthy adult population

Cervical Spine Hyperextension and Altered Posturo-Respiratory Coupling in Patients With Obstructive Sleep Apnea Syndrome

Refining scapulothoracic kinematic measurement and characterising scapulothoracic resting posture in those with and without chronic non-specific neck pain

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