Visualization on full spine radiographs of the anatomical connections of the centres of the segmental body mass supported by each vertebra and measured in vivo

Duval-Beaupère, G; Robain, G.

doi:10.1007/bf00271459

Cited by 117 publications

(73 citation statements)

References 3 publications

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“…The pattern of gradual increase in compression force values between T1 and L5 is consistent and in close agreement with findings from a previous study [13]. However, Keller et al [34] reported a greater peak compression force (exceeding 842 N at T11/T12), compared to the mean, raw peak force in the current study of 388.8 ± 105.6 N (range: 228.6-695.5 N) at L4.…”

Section: Discussionsupporting

confidence: 93%

“…The greater compression force in the Keller et al [34] study may be attributable to greater body mass (mean 76.6 kg) of their participants, more significant vertebral deformities imposed onto their model, and relatively smaller shear forces. Compression force peaked in their study at T11/T12, compared to L4 in our study and previous studies [13,18]. Although net compression forces were not different between groups at the level of fracture, compression force in the fracture group exceeded that of non-fracture cases at the level below the fracture.…”

Section: Discussioncontrasting

confidence: 45%

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The effect of osteoporotic vertebral fracture on predicted spinal loads in vivo

et al. 2006

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The aetiology of osteoporotic vertebral fractures is multi-factorial, and cannot be explained solely by low bone mass. After sustaining an initial vertebral fracture, the risk of subsequent fracture increases greatly. Examination of physiologic loads imposed on vertebral bodies may help to explain a mechanism underlying this fracture cascade. This study tested the hypothesis that model-derived segmental vertebral loading is greater in individuals who have sustained an osteoporotic vertebral fracture compared to those with osteoporosis and no history of fracture. Flexion moments, and compression and shear loads were calculated from T2 to L5 in 12 participants with fractures (66.4 ± 6.4 years, 162.2 ± 5.1 cm, 69.1 ± 11.2 kg) and 19 without fractures (62.9 ± 7.9 years, 158.3 ± 4.4 cm, 59.3 ± 8.9 kg) while standing. Static analysis was used to solve gravitational loads while muscle-derived forces were calculated using a detailed trunk muscle model driven by optimization with a cost function set to minimise muscle fatigue. Least squares regression was used to derive polynomial functions to describe normalised load profiles. Regression co-efficients were compared between groups to examine differences in loading profiles. Loading at the fractured level, and at one level above and below, were also compared between groups. The fracture group had significantly greater normalised compression (p = 0.0008) and shear force (p < 0.0001) profiles and a trend for a greater flexion moment profile. At the level of fracture, a significantly greater flexion moment (p = 0.001) and shear force (p < 0.001) was observed in the fracture group. A greater flexion moment (p = 0.003) and compression force (p = 0.007) one level below the fracture, and a greater flexion moment (p = 0.002) and shear force (p = 0.002) one level above the fracture was observed in the fracture group. The differences observed in multi-level spinal loading between the groups may explain a mechanism for increased risk of subsequent vertebral fractures. Interventions aimed at restoring vertebral morphology or reduce thoracic curvature may assist in normalising spine load profiles.

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Section: Discussionsupporting

confidence: 93%

Section: Discussioncontrasting

confidence: 45%

The effect of osteoporotic vertebral fracture on predicted spinal loads in vivo

et al. 2006

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“…Studies have confirmed that some structural features of the pelvis modulate and largely determine the amount of standing lumbar lordosis, as well as the sagittal pelvic alignment and spinopelvic balance [3,5,13,22]. These relationships have been documented in adult volunteers [3][4][5][6][7][8]22] and in patients with spinal disorders. The most important roentgenographic parameters of the sagittal balance of the spine in upright posture are well defined, and their normal physiological values have been reported [13,22].…”

Section: Introductionmentioning

confidence: 90%

Is there a sagittal imbalance of the spine in isthmic spondylolisthesis? A correlation study

et al. 2007

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Recent studies suggested a predominant role of spinopelvic parameters to explain lumbosacral spondylolisthesis pathogeny. We compare the pelvic incidence and other parameters of sagittal spinopelvic balance in adolescents and young adults with developmental spondylolisthesis to those parameters in a control group of healthy volunteers. We compared the angular parameters of the sagittal balance of the spine in a cohort of 244 patients with a developmental L5-S1 spondylolisthesis with those of a control cohort of 300 healthy volunteers. A descriptive and correlation study was performed. The L5 anterior slipping and lumbosacral kyphosis in spondylolisthesis patients was described using multiple regression analysis study. Our study demonstrates that the related measures of sagittal spinopelvic alignment are disturbed in adolescents and young adults with developmental spondylolisthesis. These subjects stand with an increased sacral slope, pelvic tilt and lumbar lordosis but with a decreased thoracic kyphosis. Pelvic incidence was significantly higher in spondylolisthesis patients as compared with controls but was not clearly correlated with the grade of slipping. We showed the same ''sagittal balance strategy'' in spondylolisthesis patients as in the control group regarding correlations between pelvic incidence, sacral slope, pelvic tilt and lumbar lordosis. We believe that the lumbosacral kyphosis is a stronger factor than pelvic incidence which need to be taken into account as a predominant factor in theories of pathogenesis of lumbosacral spondylolithesis. We thus believe that increased lumbar lordosis associated with L5-S1 spondylolisthesis is secondary to the high pelvic incidence and is an important factor causing high shear stresses at the L5-S1 pars interarticularis. However, the ''local'' sagittal imbalance of the lumbosacral junction is compensated by adjacent mobile segments in the upper lumbar spine, the pelvis orientation and the thoracic spine. The result is not optimal but a satisfactory global sagittal balance of the trunk, even in the most severe grade of slipping.

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“…The authors also emphasize the relationship of the spine to pelvic orientation changes and how they determine the spinal alignment as a whole. [9][10][11][12][13] Spino-pelvic sagittal balance is understood to be the relationship between the osteoarticular and myofascial structures of the spinal axis, the pelvis, and lower limbs directly related to postural sway.…”

Section: Introductionmentioning

confidence: 99%

Avaliação angular do equilíbrio sagital em pacientes obesos

et al. 2013

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Objectives: Given the small amount of information regarding the pathological and degenerative changes of the spine, this study was carried out in order to evaluate and quantify the angular values of sagittal balance in the obese population. Methods: We measured the angles of pelvic incidence (PI), pelvic version (PV) and sacral slope (SS). Results: We evaluated 30 patients, 19 females and 11 males, in 2012, who were to be submitted tobariatric surgery. The mean age was 33 years old. The mean BMI was 41 kg/m2, the mean value for men being 43 kg/ m2 and 39 kg/m2 for women. The mean PI was 57°. The PV was 19°. The DS was 38°. The value of pelvic incidence and pelvic version was on average higher than those found in people with normal body mass index. Regarding the sacral slope the value were the same of those of the normal population. Conclusions: Increasingly the sagittal balance has gained importance in the evaluation of the spine. It is necessary further literature and increasing medical knowledge of diseases and comorbidities that may alter sagittal balance in patients, such as obesity.Keywords: Obesity; Postural balance; Posture; Pelvis; Body mass index. RESUMO Objetivo: Tendo em vista a pouca quantidade de informações a respeito das alterações degenerativas e patológicas da coluna vertebral realizou-se este estudo com objetivo de avaliar e quantificar os valores angulares do equilíbrio sagital na população obesa. Métodos: Foram medidos os ângulos de incidência pélvica (IP), versão pélvica (VP) e declive sacral (DS

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Visualization on full spine radiographs of the anatomical connections of the centres of the segmental body mass supported by each vertebra and measured in vivo

Cited by 117 publications

References 3 publications

The effect of osteoporotic vertebral fracture on predicted spinal loads in vivo

The effect of osteoporotic vertebral fracture on predicted spinal loads in vivo

Is there a sagittal imbalance of the spine in isthmic spondylolisthesis? A correlation study

Avaliação angular do equilíbrio sagital em pacientes obesos

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