Comparison between methods of assessing lumbosacral curve obtained by radiographic image

Vacari, Daiane Aparecida; Neves, Eduardo Borba; Ulbricht, Leandra

doi:10.1590/1413-78522015230200840

Cited by 5 publications

(5 citation statements)

References 16 publications

(21 reference statements)

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“…have been used. 1,6,16,19 In the spine, there was no statistical difference between the anatomical and functional segmentationlordosis angle values. However, the limits of the lordosis, which have clinical importance in therapeutic planning and have been indicated in the etiology of junctional kyphosis, 11,20,21 were different in about 30% of the study participants.…”

Section: Discussionmentioning

confidence: 82%

“…19 However, the measurements based on these references were statistically different from the other thoracic kyphosis measurements, whichshould be used with caution considering the current concepts about the measurement and interpretation of spinal sagittal parameters. [16][17][18] Currently there is consensus around the anatomical references for measuring lumbar lordosis and L1-S1 has been used, replacing L1-L5, which was previously used. 1,6 Different geometric measurementmethods (circular arc, elliptical quadrant, etc.)…”

Section: Discussionmentioning

confidence: 99%

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Anatomic and Functional Analysis of Thoracic Kyphosis and Lumbar Lordosis

et al. 2022

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Objective: Rate and compare radiographic measurements of thoracic kyphosis and lumbar lordosis using anatomical and dynamic parameters. Methods: Measurements were performed on lateral radiographs of 10 adults of both sexes without spinal disease or deformity. Thoracic kyphosis and lumbar lordosis were measured using anatomical parameters (T1-T12, T4-T12, T5-T12 and L1-S1) or dynamic parameters (cervicothoracic or thoracolumbar inflection point). Results: Thoracic kyphosis and lumbar lordosis were different in 30% of subjects. Differences in thoracic kyphosis values were observed according to the anatomical reference used for measurement. Lumbar lordosis wasn`t statistical difference considering the anatomical or dynamic reference, but in 30% of the individuals the inflection point was different from the anatomical reference. Conclusions: Thoracic kyphosis and lumbar lordosis values differ according to anatomical and dynamic references. The reference used must be considered in the measurement and interpretation of values. Level of evidence IV; Case series.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Anatomic and Functional Analysis of Thoracic Kyphosis and Lumbar Lordosis

et al. 2022

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“…Lumbar lordosis (LL) was determined based on the angle between the superior end plate of L1 and superior end plate of S1 (Cobb’s L1–S1 method) [ 9 ].…”

Section: Methodsmentioning

confidence: 99%

Sagittal Balance, Pulmonary Function, and Spinopelvic Parameters in Severe Post-Tubercular Thoracic Kyphosis

et al. 2022

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parameters in patients with healed spinal tuberculosis with severe thoracic kyphosis. Overview of Literature: Deterioration of neurological function is an absolute indication of surgical intervention in severe posttubercular kyphosis, but the relationship of compromise in lung function and spinal alignment with severity of kyphosis is still unclear. Methods: Twenty patients (age, 14-60 years) with healed spinal tuberculosis with thoracic kyphosis >50° were included. Lateralview radiography of the whole spine, including both hips, was performed for assessment of kyphotic angle (K angle), sagittal balance, lumbar lordosis, and spinopelvic parameters. Pulmonary function was assessed by measuring the forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and their ratio (FEV1/FVC) by spirometry. Results: A positive correlation between severity of kyphosis and sagittal imbalance was noted, with compensatory mechanisms maintaining the sagittal balance in only up to 80° of dorsal kyphosis. In >80° of kyphosis, FVC was found to be markedly decreased (mean FVC=50.6%). The mean K angle was lower in subjects with lower thoracic kyphosis. In lower thoracic kyphosis, due to short lordotic and long kyphotic curves, both lumbar lordosis and pelvic retroversion worked at compensation, whereas, in middle thoracic kyphosis, due to long lordotic curve, only lumbar lordosis was required. Normal pulmonary function (mean FVC, 83.0%) and lesser kyphotic deformity (mean K angle in adolescents, 69.8°; in adults, 94.4°) were found in adolescents. Conclusions: In >80° of thoracic kyphosis, there is sagittal imbalance and a markedly affected pulmonary function. Such patients should be offered corrective surgery if they are symptomatic and medically fit to undergo the procedure. However, whether the surgical procedure would result in improved pulmonary function and sagittal balance needs to be evaluated by a follow-up study.

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“…Thoracolumbar inflection point is shown to be incident in region between T11 and T12, 49,50 or T12 and L1. 56 The cervicothoracic inflection point typically exists between thoracic and cervical spine. 45,50 Hence in our study, T12 and C7 are considered as the inferior and superior points of inflection, respectively.…”

Section: Modelingmentioning

confidence: 99%

Estimation and assessment of sagittal spinal curvature and thoracic muscle morphometry in different postures

Zhang

Ashjaee

et al. 2021

Proc Inst Mech Eng H

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Spine models are typically developed from supine clinical imaging data, and hence clearly do not fully reflect postures that replicate subjects’ clinical symptoms. Our objectives were to develop a method to: (i) estimate the subject-specific sagittal curvature of the whole spine in different postures from limited imaging data, (ii) obtain muscle lines-of-action in different postures and analyze the effect of posture on muscle fascicle length, and (iii) correct for cosine between the magnetic resonance imaging (MRI) scan plane and dominant fiber line-of-action for muscle parameters (cross-sectional area (CSA) and position). The thoracic spines of six healthy volunteers were scanned in four postures (supine, standing, flexion, and sitting) in an upright MRI. Geometry of the sagittal spine was approximated with a circular spline. A pipeline was developed to estimate spine geometry in different postures and was validated. The lines-of-action for two muscles, erector spinae (ES) and transversospinalis (TS) were obtained for every posture and hence muscle fascicle lengths were computed. A correction factor based on published literature was then computed and applied to the muscle parameters. The maximum registration error between the estimated spine geometry and MRI data was small (average RMSE∼1.2%). The muscle fascicle length increased (up to 20%) in flexion when compared to erect postures. The correction factor reduced muscle parameters (∼5% for ES and ∼25% for TS) when compared to raw MRI data. The proposed pipeline is a preliminary step in subject-specific modeling. Direction cosines of muscles could be used while improving the inputs of spine models.

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Comparison between methods of assessing lumbosacral curve obtained by radiographic image

Cited by 5 publications

References 16 publications

Anatomic and Functional Analysis of Thoracic Kyphosis and Lumbar Lordosis

Anatomic and Functional Analysis of Thoracic Kyphosis and Lumbar Lordosis

Sagittal Balance, Pulmonary Function, and Spinopelvic Parameters in Severe Post-Tubercular Thoracic Kyphosis

Estimation and assessment of sagittal spinal curvature and thoracic muscle morphometry in different postures

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