A Database for Estimating Normal Spinal Motion Derived From Noninvasive Measurements

Gracovetsky, Serge; Newman, N.; Pawlowsky, Marc; Lanzo, Victor; Davey, B W; Robinson, Laura

doi:10.1097/00007632-199505000-00010

Cited by 112 publications

(56 citation statements)

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“…To analyze the effect of each experimental condition, movements were compared with respect to the instants of product grasping, scanning and depositing. The consistent pattern between radiographic and video analysis in the sagittal and frontal planes 18 encouraged the authors to discuss the findings of the present study assuming a close relationship between the kinematics of the trunk and the vertebral column. The spinal model and similar experimental approach is also similar to that reported by other studies (e.g.…”

Section: Resultssupporting

confidence: 63%

The effect of different supermarket checkout workstations on trunk kinematics of checkout operators

Rodacki¹,

Vieira²

2010

Rev. bras. fisioter.

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Objectives: This study analyzed the effect of a standard and a modified checkout workstation during a simulated task on trunk postures of a supermarket checkout operator. Methods: Eight participants performed a task involving grasping, scanning and depositing products, while 3D images of the trunk were collected. Results: A number of kinematic changes were observed in trunk posture. A greater anterior flexion (3.0±1.2 o ) and lateral bending during grasping (7.1±1.4 o ) were found in the standard checkout workstation when compared to the modified model (p<0.05). Other variables did not show significant differences (p>0.05). Discussion: The modified checkout workstation provided less lateral bending of the trunk to grasp products (8.1 o ± 2.8; p<0.05), which was considered an advantage with respect to the standard model. Changes in the sagittal and transversal planes were not observed (p>0.05), irrespective of the checkout workstations (p>0.05). The modified checkout workstation successfully reduced risk of injury in some aspects, particularly the problems associated with lateral bending of the trunk. Other studies are required to test whether such potential benefits are obtained on a daily basis. Conclusions: Supermarket checkout operators may be at high risk of occupational injury due to different workstation demands.Modifications to checkout workstation design are an attractive possibility to reduce postural stress and fatigue in checkout operators.Longitudinal studies are required to test whether changes observed in the present study are sustained in the long term.Key words: supermarket checkout operators; supermarket checkout workstation; checkout workstation design; posture. ResumoObjetivos: Analisar o efeito de um modelo padrão e de um modificado de checkout durante uma tarefa simulada de um operador de caixa de supermercado. Métodos: Oito participantes desempenharam uma tarefa envolvendo apanhar, ler e depositar produtos, enquanto imagens 3D do tronco foram coletadas. Resultados: Um número de mudanças cinemáticas foram observadas na postura do tronco. Uma maior flexão anterior (3.0±1.2 o ) e uma inclinação lateral durante o apanhar (7.1±1.4 o ) foram encontradas no checkout padrão quando comparadas ao modelo modificado (p<0.05). Outras variáveis não apresentaram mudanças significativas (p>0.05).Discussão: O checkout modificado causou menor inclinação lateral do tronco para apanhar produtos (8.1 o ± 2.8; p<0.05), o que foi considerado como uma vantagem em relação ao modelo padrão. Mudanças nos planos sagital transverso não foram observadas (p>0.05), independente do modelo do checkout (p>0.05). O modelo modificado se mostrou eficaz paras prover reduções de risco de lesão em alguns aspectos. Especificamente, problemas associados com as inclinações laterais do tronco podem ser reduzidos quando o checkout modificado é empregado. Outros estudos são necessários para testar se tais benefícios potenciais são obtidos em uso de base diária. Conclusões: Operadores de supermercado podem ter elevado risco de le...

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Section: Resultssupporting

confidence: 63%

The effect of different supermarket checkout workstations on trunk kinematics of checkout operators

Rodacki¹,

Vieira²

2010

Rev. bras. fisioter.

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“…However, in the absence of a true criterion standard for MCI diagnosis, this method reflects current clinical practice (Gracovetsky et al, 1995).…”

Section: Limitations Of Present Researchmentioning

confidence: 99%

The validity of O’Sullivan’s classification system (CS) for a sub-group of NS-CLBP with motor control impairment (MCI): Overview of a series of studies and review of the literature

Dankaerts

O’Sullivan

2011

Manual Therapy

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a b s t r a c tChronic Low Back Pain (LBP) remains a common, recalcitrant and costly problem for the individual sufferer and for society. Effective treatments that reduce the social and economic burden have yet to be established for the majority of chronic LBP cases. Lack of evidence for specific interventions has been blamed on the heterogeneity of the chronic LBP population as well as a lack of a patient centred biopsycho-social approach. This issue of heterogeneity has resulted in classification being considered the highest research priority in the area of chronic LBP. The potential for a 'wash-out effect' caused by the heterogeneity of the chronic LBP populations sampled for randomised controlled clinical trials (RCTs), has driven the need for classifying patients with nonspecific chronic LBP. A summary of a series of studies is outlined in this review paper. They represent a comprehensive investigation into the validity of O'Sullivan's proposed mechanism-based classification system (CS) for a sub-group of localized mechanically provoked nonspecific chronic LBP with motor control impairment (MCI). Further, the findings of these studies are discussed in relation to the relevant literature and the clinical implications arising are presented. Finally, the limitations of this research are outlined and recommendations for future research are made.

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“…Most cadaveric studies tested motion segments by applying a flexionextension, bending, or axial rotation torque, with or without a compressive load to measure the vertebral motion using various techniques [8,[11][12][13][14][15]. Most of the in vivo studies have used skin markers or plain radiographs to measure the vertebral motion during various dynamic motion or static postures [16][17][18]. Three-dimensional CT and MRI imaging techniques have also been used to determine the vertebral motion during passive axial rotation of the lumbar spine [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Investigation of coupled bending of the lumbar spine during dynamic axial rotation of the body

et al. 2013

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Purpose Little is known about the coupled motions of the spine during functional dynamic motion of the body. This study investigated the in vivo characteristic motion patterns of the human lumbar spine during a dynamic axial rotation of the body. Specifically, the contribution of each motion segment to the lumbar axial rotation and the coupled bending of the vertebrae during the dynamic axial rotation of the body were analyzed. Methods Eight asymptomatic subjects (M/F, 7/1; age, 40-60 years) were recruited. The lumbar segment of each subject was MRI scanned for construction of 3D models of the vertebrae from L2 to S1. The lumbar spine was then imaged using a dual fluoroscopic system while the subject performed a dynamic axial rotation from maximal left to maximal right in a standing position. The 3D vertebral models and the fluoroscopic images were used to reproduce the in vivo vertebral motion. In this study, we analyzed the primary left-right axial rotation, the coupled left-right bending of each vertebral segment from L2 to S1 levels. ResultsThe primary axial rotations of all segments (L2-S1) followed the direction of the body axial rotation. Contributions of each to the overall segment axial rotation were 6.7°± 3.0°(27.9 %) for the L2-L3, 4.4°± 1.2°( 18.5 %) for the L3-L4, 6.4°± 2.2°(26.7 %) for the L4-L5, and 6.4°± 2.6°(27.0 %) for the L5-S1 vertebral motion segments. The upper segments of L2-L3 and L3-L4 demonstrated a coupled contralateral bending towards the opposite direction of the axial rotation, while the lower segments of L4-L5 and L5-S1 demonstrated a coupled ipsilateral bending motion towards the same direction of the axial rotation. Strong correlation between the primary axial rotation and the coupled bending was found at each vertebral level. We did not observe patterns of coupled flexion/extension rotation with the primary axial rotation. Conclusions This study demonstrated that a dynamic lumbar axial rotation coupling with lateral bendings is segment-dependent and can create a coordinated dynamic coupling to maintain the global dynamic balance of the body. The results could improve our understanding of the normal physiologic lumbar axial rotation and to establish guidelines for diagnosing pathological lumbar motion.

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A Database for Estimating Normal Spinal Motion Derived From Noninvasive Measurements

Cited by 112 publications

References 0 publications

The effect of different supermarket checkout workstations on trunk kinematics of checkout operators

The effect of different supermarket checkout workstations on trunk kinematics of checkout operators

The validity of O’Sullivan’s classification system (CS) for a sub-group of NS-CLBP with motor control impairment (MCI): Overview of a series of studies and review of the literature

Investigation of coupled bending of the lumbar spine during dynamic axial rotation of the body

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