Pelvifemoral rhythm during unilateral hip flexion in standing

Murray, Richard W; Bohannon, Richard W.; Tiberio, David; Dewberry, Michael J.; Zannotti, Chad M.

doi:10.1016/s0268-0033(01)00115-2

Cited by 39 publications

(34 citation statements)

References 10 publications

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“…The mean ratio of pelvis rotation to hip flexion has been reported to be 26% when knees are flexed [3], and 39% when knees are straight, with subjects in the supine position [4]. In the standing position, the pelvis rotation could contribute 18.1% to hip flexion (leg raise with knees flexed) [16].…”

Section: Discussionmentioning

confidence: 99%

“…Further, the stresses and strains in the complex ligamentous system that connects the pelvis to the spine are also directly influenced by the degree of rotation of the pelvis in the sagittal plane. The degree of rotation of the pelvis, in turn, is governed somewhat by the 'pelvifemoral rhythm' [7,16] which describes the normal interactive motions of the pelvis and the femur. Since several of the muscles of the anterior and posterior compartments of the thigh span both the knee and hip joints, the knee joint flexion angle and muscle activations may affect this pelvifemoral rhythm.…”

Section: Introductionmentioning

confidence: 99%

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Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Shin

Shu

et al. 2004

Journal of Electromyography and Kinesiology

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Shin

Shu

et al. 2004

Journal of Electromyography and Kinesiology

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“…The mean ratio of pelvis rotation to hip flexion has been reported to be 26% when knees are flexed (Bohannon et al, 1985a), and 39% when knees are straight, with subjects in the supine position (Bohannon et al, 1985b). In standing position, the pelvis rotation could contribute 18.1% to hip flexion (leg raise with knees flexed) (Murray et al, 2002). As the person bends forward from upright standing posture ( Figure 3.6a), the pelvis freely rotates forward until the passive tension in the hamstrings begins to influence the pelvic rotation.…”

Section: Discussionmentioning

confidence: 99%

Viscoelastic Responses of the Lumbar Spine during Prolonged Stooping

Shin

Mirka

Loboa

2005

Proceedings of the Human Factors and Ergonomics Society Annual

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There is considerable evidence that awkward postures of the low back are related to the incidence of low back disorders (LBDs). Specifically, the stooped or fully flexed posture maintained over a prolonged period of time has been known to lead to LBDs in many industrials tasks but the specific biomechanics/physiology of this link is not fully developed.This study combined empirical work with finite element analyses to explore this relationship.The empirical work focused on quantifying the time-dependent responses of the lumbar spine during a prolonged stooped posture by assessing the changes in the sagittal plane range of lumbar flexion and the electromyographic activity of the back extensor musculature in the isokinetic lifts during and after prolonged stooping. Ten healthy participants performed a regimen of a 10-minute stooping period followed by a 10-minute upright standing recovery period, with an isokinetic lift every 2.5 minutes. Results showed significant creep effects of the flexion angle and the increased activity of extensor muscles during stooping to compensate for the reduced extensor moment producing capability of the passive tissues. The 10-minute upright standing did not produce a full recovery of the lumbar spine tissues but a 30-second rest break in the middle of the stooping period moderated these viscoelastic responses.A three-dimensional finite element (FE) model of the lumbar spine was developed to predict the responses of the passive and active tissues of the low back during the prolonged stooping and recovery period. This model employed a nonlinear stress-strain relationship describing the viscoelastic material properties of individual components of the lumbar spine.The trunk flexion tasks that were performed in the in vivo empirical work were simulated in the FE model and the predicted results (range of motion, muscle activation levels, etc.) were compared with experimental results to validate the model. The predicted results by the FE model showed high correlation (R>0.9) with the in vivo experimental results, confirming the capability of the FE model as a potential tool for risk assessment of the prolonged stooping tasks.Results of the in vivo experiment suggested the importance of proper duty cycles in reducing LBD risks due to repetitive prolonged stooping in work-related tasks. The FE model of this study showed potential to simulate various prolonged stooped postures in occupational tasks and predict time-dependent stress/strain of individual spinal tissues. The data from these simulations can be used to design better work postures and duty cycles that can reduce the risks for LBDs, without sacrificing work productivity. VISCOELASTIC RESPONSES OF THE LUMBAR SPINE DURING PROLONGED STOOPING by GWANSEOB SHINA dissertation submitted to the Graduate

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“…Дюберрі та співавтори описують відмінності в задньому обертанні таза: з колінним суглобом у положенні згинання 26% згинання стегна відбувається в результаті попереково-тазового обертання, а з колінним суглобом у положенні розгинання у результаті попереково-тазового обертання відбувається 39% згинання стегна [18]. Вважається, що під час піднімання ваги вплив обертання таза на згинання стегна становить 18 % [20].…”

Section: таблиця 1 середні значення максимального руху стегна у 3 ріunclassified

Погляд Спортивного Травматолога На Біомеханіку Кульшового Суглоба

Zazirnyi¹,

Ryzhkov²

2021

TRAUMA

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Погляд спортивного травматолога на біомеханіку кульшового суглобаРезюме. Як основна ланка між верхньою частиною тіла та нижньою кінцівкою кульшовий суглоб відіграє важливу роль у розвитку та передачі імпульсів сили під час виконання щоденних рутинних дій та спортивних вправ. Для цього суглоба характерний надзвичайно високий рівень природної кісткової стійкості, а особливості його кісткової структури значно впливають на його біомеханічні властивості. Ці біомеханічні принципи мають велике значення при встановленні діагнозу та показань до оперативного лікування структурних аномалій кульшового суглоба, а також для розуміння фізичних навантажень на кульшовий суглоб під час спортивних тренувань, які можуть призвести до травм або хронічних патологічних процесів.

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Pelvifemoral rhythm during unilateral hip flexion in standing

Cited by 39 publications

References 10 publications

Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Viscoelastic Responses of the Lumbar Spine during Prolonged Stooping

Погляд Спортивного Травматолога На Біомеханіку Кульшового Суглоба

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