Effect of trunk inclination on lower limb joint and lumbar moments in able men during the stance phase of gait

Leteneur, Sébastien; Gillet, Christophe; Sadeghi, Heydar; Allard, Paul; Barbier, Franck

doi:10.1016/j.clinbiomech.2008.10.005

Cited by 68 publications

(63 citation statements)

References 35 publications

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“…Furthermore, subjects significantly increased trunk flexion, which was accompanied by an increase in anterior pelvic tilt at the time of opposite toe off. Previous studies of able-bodied individuals have shown an association between trunk flexion and hip extension moments [46], such that an increase in trunk flexion may enhance knee joint stability [29,30]. However, to our knowledge, this study is the first to quantify changes in trunk flexion as a mechanism to stabilize a passive prosthetic knee joint for persons with transfemoral amputation.…”

Section: Early Stance Response To the Alignment Perturbationmentioning

confidence: 60%

The biomechanical response of persons with transfemoral amputation to variations in prosthetic knee alignment during level walking

2016

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Prosthetic alignment is an important factor in the overall fit and performance of a lower-limb prosthesis. However, the association between prosthetic alignment and control strategies used by persons with transfemoral amputation to coordinate the movement of a passive prosthetic knee is poorly understood. This study investigated the biomechanical response of persons with transfemoral amputation to systematic perturbations in knee joint alignment during a level walking task. Quantitative gait data were collected for three alignment conditions: bench alignment, 2 cm anterior knee translation (ANT), and 2 cm posterior knee translation (POST). In response to a Participation Follow-Up: The authors do not plan to inform participants of the publication of this study. However, participants have been encouraged to check the Northwestern University Prosthetics-Orthotics Center Web site for updated publications related to the program's activities, which include the present study. Disclaimer:The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the VA or the U.S. Government. U.S. Department of Veterans AffairsPublic Access Author manuscript J Rehabil Res Dev. Author manuscript; available in PMC 2017 August 17. VA Author ManuscriptVA Author Manuscript VA Author Manuscript destabilizing alignment perturbation (ANT), subjects significantly increased their early-stance hip extension moment, confirming that persons with transfemoral amputation rely on a hip extensor strategy to maintain knee joint stability. However, subjects also decreased the rate at which they loaded their prosthesis, decreased their step length, increased their trunk flexion, and maintained their limb in a more vertical posture at the time of opposite toe off. Collectively, these results suggest that persons with transfemoral amputation rely on a combination of strategies to coordinate stance-phase knee flexion. Further, no significant changes were observed in response to the POST condition, suggesting that a bias toward posterior alignment may have fewer implications in terms of stance-phase, knee-joint control.

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Section: Early Stance Response To the Alignment Perturbationmentioning

confidence: 60%

The biomechanical response of persons with transfemoral amputation to variations in prosthetic knee alignment during level walking

2016

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“…Forty-three spherical reflective markers were placed on anatomic landmarks for each participant to model the whole body in fourteen segments [12]. A 3D-optoelectronic motion analysis system composed of ten cameras (Vicon 1 , OxfordMetrics, UK) captured these markers throughout GI at a sample rate of 120 Hz.…”

Section: Participants and Apparatusmentioning

confidence: 99%

Effect of natural trunk inclination on variability in soleus inhibition and tibialis anterior activation during gait initiation in young adults

et al. 2015

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“…This is evident in a left-right asymmetrical behaviour during locomotion in able-bodied participants, even with equal leg masses (Sadeghi et al, 2000), in temporal and kinematic parameters (Gundersen et al, 1989), in GRF (Herzog et al, 1989) and in joint moments (Leteneur et al, 2009). While such inter-limb asymmetries have been extensively studied in human walking and also in technical walking systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…legged robots, prosthetic legs) (Merker et al, 2011), the intra-limb asymmetries in leg function are not well understood. In spite of a considerable number of studies on the potential effect of trunk posture on the human walkers whether as an imposed trunk posture (Grasso et al, 2000;Saha et al, 2008;Kluger et al, 2014), the natural inclination of the trunk (Leteneur et al, 2009(Leteneur et al, , 2013 or age-related flexed posture (McGibbon and Krebs, 2001;de Groot et al, 2014), little is known about the effects of trunk orientation on the axial leg function, specifically when trunk posture is varied across a wide range of angles in the sagittal plane.…”

Section: Introductionmentioning

confidence: 99%

“…The human trunk accounts for more than 50% of total body mass; hence, trunk orientation has a significant effect on the position of the CoM and human locomotion (de Leva, 1996;Gillet et al, 2003;Leteneur et al, 2009). The trunk stabilization, basically the task of balancing an unstable inverted pendulum standing on the hip (Maus et al, 2010), is an important task in human locomotion.…”

Section: Introductionmentioning

confidence: 99%

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Increasing trunk flexion morphs human leg function into that of birds despite different leg morphology

Aminiaghdam

Rode

Müller

et al. 2016

Journal of Experimental Biology

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Pronograde trunk orientation in small birds causes prominent intra-limb asymmetries in the leg function. As yet, it is not clear whether these asymmetries induced by the trunk reflect general constraints on the leg function regardless of the specific leg architecture or size of the species. To address this, we instructed 12 human volunteers to walk at a self-selected velocity with four postures: regular erect, or with 30 deg, 50 deg and maximal trunk flexion. In addition, we simulated the axial leg force (along the line connecting hip and centre of pressure) using two simple models: spring and damper in series, and parallel spring and damper. As trunk flexion increases, lower limb joints become more flexed during stance. Similar to birds, the associated posterior shift of the hip relative to the centre of mass leads to a shorter leg at toe-off than at touchdown, and to a flatter angle of attack and a steeper leg angle at toe-off. Furthermore, walking with maximal trunk flexion induces right-skewed vertical and horizontal ground reaction force profiles comparable to those in birds. Interestingly, the spring and damper in series model provides a superior prediction of the axial leg force across trunk-flexed gaits compared with the parallel spring and damper model; in regular erect gait, the damper does not substantially improve the reproduction of the human axial leg force. In conclusion, mimicking the pronograde locomotion of birds by bending the trunk forward in humans causes a leg function similar to that of birds despite the different morphology of the segmented legs.

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Effect of trunk inclination on lower limb joint and lumbar moments in able men during the stance phase of gait

Cited by 68 publications

References 35 publications

The biomechanical response of persons with transfemoral amputation to variations in prosthetic knee alignment during level walking

The biomechanical response of persons with transfemoral amputation to variations in prosthetic knee alignment during level walking

Effect of natural trunk inclination on variability in soleus inhibition and tibialis anterior activation during gait initiation in young adults

Increasing trunk flexion morphs human leg function into that of birds despite different leg morphology

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