Predictive equations to estimate spinal loads in symmetric lifting tasks

Arjmand, Navid; Plamondon, André; Shirazi‐Adl, A.; Larivière, Christian; Parnianpour, Mohamad

doi:10.1016/j.jbiomech.2010.08.028

Cited by 81 publications

(44 citation statements)

References 48 publications

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“…Arjmand et al (Arjmand et al, 2011, Arjmand et al, 2012) recently derived predictive equations to estimate spinal loads in lifting tasks using FE models and optimization for muscle forces. Lifting and holding a 20 kg weight, compressive and shear forces were reported up to 1924 N and 686 N at L4-5 level, and up to 5474 N and 5026 N at L5-S1 (Arjmand et al, 2011). The overall forces were larger than our results and probably because of holding the 20 kg heavy weight, which is difficult to test in our in vivo lifting setup.…”

Section: Discussionmentioning

confidence: 99%

“…(Rohlmann et al, 2000, Rohlmann et al, 2009a, Abe et al, 1999, Kumar et al, 2005). Numerous studies have investigated spinal loads using experimental measurements and computational simulations (Wilke et al, 1999, Nachemson, 1981, Shirazi-Adl et al, 2005, Kim et al, 2011, Rohlmann et al, 2009b, Shirazi-Adl, 1994a, Shirazi-Adl, 2006, Arjmand et al, 2011, Arjmand et al, 2012). Pressure transducers have been inserted into the nucleus pulposus (NP) in living human volunteers during sitting, standing and other daily activities (Wilke et al, 1999, Andersson et al, 1977, Nachemson, 1981, Polga et al, 2004), while overall disc loads were calculated from the intradiscal pressure and the total effective area of the disc.…”

Section: Introductionmentioning

confidence: 99%

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In vivo loads in the lumbar L3–4 disc during a weight lifting extension

Wang

Park

Kim

et al. 2014

Clinical Biomechanics

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Background Knowledge of in vivo human lumbar loading is critical for understanding the lumbar function and for improving surgical treatments of lumbar pathology. Although numerous experimental measurements and computational simulations have been reported, non-invasive determination of in vivo spinal disc loads is still a challenge in biomedical engineering. The object of the study is to investigate the in vivo human lumbar disc loads using a subject-specific and kinematic driven finite element approach. Methods Three dimensional (3D) lumbar spine models of three living subjects were created using MR images. A 3D finite element model of the L3-4 disc, including the annulus fibrosus and nucleus pulposus, was built for each subject. The endplate kinematics of the L3-4 segment of each subject during a dynamic weight lifting extension was determined using a dual fluoroscopic imaging technique. The endplate kinematics was used as displacement boundary conditions of the subject specific finite element model of the L3-4 disc to calculate the in-vivo disc forces and moments during the weight lifting activity. Findings During the weight lifting extension, the L3-4 disc experienced maximum shear load of about 230 N or 0.34 bodyweight at the flexion position and maximum compressive load of 1500 N or 2.28 bodyweight at the upright position. The disc experienced a primary flexion-extension moment during the motion which reached a maximum of 4.2 Nm at upright position with stretched arms holding the weight. Interpretation This study provided quantitative data on in vivo disc loading that could help understand intrinsic biomechanics of the spine and improve surgical treatment of pathological discs using fusion or arthroplasty techniques.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In vivo loads in the lumbar L3–4 disc during a weight lifting extension

Wang

Park

Kim

et al. 2014

Clinical Biomechanics

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“…Today, with the advent of the information society, physical activities have decreased and sedentary lifestyles have rapidly increased the number of cases of spinal diseases, which are becoming a social problem7 ) . Accordingly, this study systematically examined differences in postural balance according to the degree of adolescents’ idiopathic scoliosis and discusses treatment for them.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Scoliosis Angle on Center of Gravity Sway

Park

Lee³

et al. 2013

J Phys Ther Sci

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[Purpose] The purpose of this study was to verify the effects of idiopathic scoliosis on the human body by comparing the postural balance of adolescents with and without idiopathic scoliosis, to provide basic data for the optimal desirable growth and development of adolescents. [Subjects] The subjects were 128 adolescents diagnosed with scoliosis on X-ray by orthopedists. The subjects were divided into a 10 to 19 degree group, 20 to 29 degree group, and 30 degree and over group according to the degree of scoliosis. For comparison, 15 normal adolescents without orthopedic injury within the last 6 months were selected as a control group. [Methods] As measurement tools, DK2 525R (Dongkang Medical: Korea) was used to measure the Cobb angle and a multifunktional traininggeraete device (MFT, Germany) was used to measure balance. One-way variance of analysis was conducted in order to examine differences among the four groups in left and right balance, forward and backward balance, and overall postural balance, and when there were differences, they were compared in detail using Duncan’s post-hoc test. [Results] The results of scoliosis angle and body mass index (BMI) showed significant differences between the normal group (NG) and the scoliosis groups (GI, G II, G III), but there were no significant differences among the scoliosis groups. The scoliosis groups showed a significantly lower BMI than that of the normal group. In addition, the results of the left/right and the front/rear balance abilities showed significant differences between the normal group and the scoliosis groups. Furthermore, the results of whole body balance ability were showed significant differences between the normal group and the scoliosis groups.

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“…If this force passes close to the centroid of the vertebrae, it ensures that shear and bending moments are small [14] and if it lies within the vertebrae it ensures stability. Although models for the spine have become increasingly sophisticated [15][16][17][18], only some consider posture [15,16,19] and many do not take into account the actual curvature of individual spines.…”

Section: Introductionmentioning

confidence: 99%

The lumbar spine has an intrinsic shape specific to each individual that remains a characteristic throughout flexion and extension

et al. 2014

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Purpose We have previously shown that the lumbar spine has an intrinsic shape specific to the individual and characteristic of sitting, standing and supine postures. The purpose of this study was to test the hypothesis that this intrinsic shape is detectable throughout a range of postures from extension to full flexion in healthy adults. Methods Sagittal images of the lumbar spine were taken using a positional MRI with participants (n = 30) adopting six postures: seated extension, neutral standing, standing with 30, 45 and 60°and full flexion. Active shape modelling (ASM) was used to identify and quantify 'modes' of variation in the shape of the lumbar spine. Results ASM showed that 89.5 % of the variation in the shape of the spine could be explained by the first two modes; describing the overall curvature and the distribution of curvature of the spine. Mode scores were significantly correlated between all six postures (modes 1-9, r = 0.4-0.97, P \ 0.05), showing that an element of intrinsic shape was maintained when changing postures. The spine was most even in seated extension (P \ 0.001) and most uneven between 35 and 45°flexion (P \ 0.05). Conclusions This study shows that an individual's intrinsic lumbar spine shape is quantifiable and detectable throughout lumbar flexion and extension. These findings will enable the role of lumbar curvature in injury and low back pain to be assessed in the clinic and in the working and recreational environments.

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Predictive equations to estimate spinal loads in symmetric lifting tasks

Cited by 81 publications

References 48 publications

In vivo loads in the lumbar L3–4 disc during a weight lifting extension

In vivo loads in the lumbar L3–4 disc during a weight lifting extension

The Effect of Scoliosis Angle on Center of Gravity Sway

The lumbar spine has an intrinsic shape specific to each individual that remains a characteristic throughout flexion and extension

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