Effect of ligament stiffness on spinal loads and muscle forces in flexed positions

Han, Kap-Soo; Rohlmann, A.; Kim, Kyung-Soo; Cho, Kum Won; Kim, Yoon Hyuk

doi:10.1007/s12541-012-0296-8

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…For example, Han and his colleagues enhanced and validated the model to predict muscle forces and to determine the effects of body height and weight on lumbar spine loading [ 5 , 6 ]. Additionally, they studied the effect of different stiffness on joint and muscle forces and discovered a large influence of ligament stiffness on individual muscle forces [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

A numerical study to determine the effect of ligament stiffness on kinematics of the lumbar spine during flexion

Putzer

Auer

Malpica³

et al. 2016

BMC Musculoskelet Disord

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BackgroundThere is a wide range of mechanical properties of spinal ligaments documented in literature. Due to the fact that ligaments contribute in stabilizing the spine by limiting excessive intersegmental motion, those properties are of particular interest for the implementation in musculoskeletal models. The aim of this study was to investigate the effect of varying ligament stiffness on the kinematic behaviour of the lumbar spine.MethodsA musculoskeletal model with a detailed lumbar spine was modified according to fluoroscopic recordings and corresponding data files of three different subjects. For flexion, inverse dynamics analysis with a variation of the ligament stiffness matrix were conducted. The influence of several degrees of ligament stiffness on the lumbar spine model were investigated by tracking ligament forces, disc forces and resulting moments generated by the ligaments. Additionally, the kinematics of the motion segments were evaluated.ResultsAn increase of ligament stiffness resulted in an increase of ligament and disc forces, whereas the relative change of disc force increased at a higher rate at the L4/L5 level (19 %) than at the L3/L4 (10 %) level in a fully flexed posture. The same behaviour applied to measured moments with 67 % and 45 %. As a consequence, the motion deflected to the lower levels of the lumbar spine and the lower discs had to resist an increase in loading.ConclusionsHigher values of ligament stiffness over all lumbar levels could lead to a shift of the loading and the motion between segments to the lower lumbar levels. This could lead to an increased risk for the lower lumbar parts.

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Section: Introductionmentioning

confidence: 99%

A numerical study to determine the effect of ligament stiffness on kinematics of the lumbar spine during flexion

Putzer

Auer

Malpica³

et al. 2016

BMC Musculoskelet Disord

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“…Detailed contents on the modeling and verification of this spine model can be found in previous studies. [19][20][21][22][23][24] Figure 1 shows the schematics of the modeling that used a tilting device. The modeling can be briefly explained as follows.…”

Section: Musculoskeletal Model Descriptionmentioning

confidence: 99%

Analysis of Muscle Strength Effects on Exercise Performance Using Dynamic Stabilization Exercise Device

Han

Kang

Kwon

2020

J. Mech. Med. Biol.

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Muscle strength may vary depending on the pathological issues and static life habits. These conditions lead to abnormal spinal loads and change muscle strength as well as activation patterns, thereby causing spinal disorders. In this study, the effects of muscle strength on the spine stabilization exercise were analyzed using a whole-body tilt device. Musculoskeletal modeling was performed and the results were validated through a comparison with the electromyography (EMG) analysis results. Based on the validated basic model, modeling was performed for the whole-body tilt device. To examine the exercise effect and muscle activation while the maximum muscle force capacity (MFC) was varied from 30[Formula: see text]N/cm2 to 60[Formula: see text]N/cm2 and 90[Formula: see text]N/cm2, the muscle force was predicted through inverse dynamics analysis. When MFC was 30[Formula: see text]N/cm2, the posterior direction of the tilt could not be analyzed (no solution found). When MFC was 60[Formula: see text]N/cm2, it could be analyzed, but the muscle force was predicted to be higher compared to when MFC was 90[Formula: see text]N/cm2. It was confirmed that muscle strength is a very important element for maintaining postural activities and performing exercise. Therefore, for rehabilitation patients and elderly people with weak muscle strength, hard or extreme exercise may cause musculoskeletal injuries.

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“…Details of the development of the MS model are presented in the previous publications and the validity of the adopted model (Figs. 2 and 3) was obtained for the purpose of this study by comparison with the in vivo experiments in the previous studies [11][12][13][14]. In brief, the whole body model consists of several segments which are rigid bodies with simple joints: the skull, arms, legs, pelvis, and spine.…”

Section: The Model Descriptionmentioning

confidence: 99%

“…Tensile forces of ligaments were exerted depending on the nonlinear stiffness (the load-deformation curve) obtained from the previous experimental and analytical data [17,18]. Ligaments were designed to activate as they were stretched over each slack length and calibrated in several activities [13].…”

Section: The Model Descriptionmentioning

confidence: 99%

“…Recently, analytical spine models [11][12][13][14] for predicting internal spinal loads and muscle forces have been widely used to investigate the biomechanical behavior of the spine. These models can be useful to explore the area where the experimental approaches are seldom applied to quantify the effect of muscle strengthening exercise programs on the specific muscles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Core muscle Strengthening Effect During Spine Stabilization Exercise

Han¹,

Nam²

2015

Journal of Electrical Engineering and Technology

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-Core spinal muscles are related to trunk stability and assume the main role of stabilizing the spine during daily activities; strengthening of core muscles around the spine can therefore reduce the chance of back pain. The objective of the study was to investigate the effect of core muscle strengthening in the spine during spine stabilization exercise using a whole body tilt device. To achieve this, a validated musculoskeletal (MS) model of the whole body was used to replicate the input motion from the whole body tilting exercise. An inverse dynamics analysis was executed to estimate spine loads and muscle forces depending on the tilting angles of the exercise device. The activation of long and superficial back muscles such as the erector spinae (iliocostalis and longissimus) were mainly affected by the forward direction (-40°) of the tilt, while the front muscles (psoas major, quadratus lumborum, and external and internal obliques) were mainly affected by the backward tilting direction (40°). Deep muscles such as the multifidi and short muscles were activated in most directions of the rotation and tilt. The backward directions of the tilt using this device could be carefully applied for the elderly and for rehabilitation patients who are expected to have less muscle strength. In this study, it was shown that the spine stabilization exercise device can provide considerable muscle exercise effect.

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Effect of ligament stiffness on spinal loads and muscle forces in flexed positions

Cited by 6 publications

References 32 publications

A numerical study to determine the effect of ligament stiffness on kinematics of the lumbar spine during flexion

A numerical study to determine the effect of ligament stiffness on kinematics of the lumbar spine during flexion

Analysis of Muscle Strength Effects on Exercise Performance Using Dynamic Stabilization Exercise Device

Core muscle Strengthening Effect During Spine Stabilization Exercise

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