Passive elastic contribution of hip extensors to joint moments during walking in people with low back pain

TY - JOUR

T1 - Passive elastic contribution of hip extensors to joint moments during walking in people with low back pain

AU - Hines, Mark

AU - Tillin, Neale

AU - Luo, Jin

AU - Lee, Raymond

PY - 2018/10/14

Y1 - 2018/10/14

N2 - Background: It has been found that alterations in passive muscle properties may be associated with low back pain, and these may be responsible for the altered gait parameters often observed in subjects with back pain. The purpose of the present study was to assess total hip and passive hip extensor moments in people with or without low back pain during the hip flexion component of walking. Methods: 52 subjects volunteered for this study (low back pain group, n=25 (male n=13, female n=12), control group, n=27 (male n=15, female n=12)). Passive hip moments were calculated using an adapted force transducer during supine testing. A biomechanical model and predictive equation were used to calculate passive hip moments during walking. Total hip moments were calculated with the use of a 9 camera, 3-D motioncapture system.Findings: Independent samples t-tests demonstrated no significant differences between groups for gait parameters or hip or knee angles. Results of the ANOVAs demonstrated significant differences in passive hip flexor moments during the second half of hip flexion (P < 0.05).There were also significant differences in hip power and work done during peaks of power absorption and the second peak of power generation (P < 0.05). Interpretation: The present data demonstrates that subjects with low back pain have altered passive hip extensor and total power and work done during walking compared with healthy controls. Biomechanical models should include individual measurements of passive joint moments. © 2018, Elsevier. The attached document (embargoed until 14/10/2019) is an author produced version of a paper published in CLINICAL BIOMECHANICS uploaded in accordance with the publisher’s self- archiving policy. The final published version (version of record) is available online at the link below. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it.

AB - Background: It has been found that alterations in passive muscle properties may be associated with low back pain, and these may be responsible for the altered gait parameters often observed in subjects with back pain. The purpose of the present study was to assess total hip and passive hip extensor moments in people with or without low back pain during the hip flexion component of walking. Methods: 52 subjects volunteered for this study (low back pain group, n=25 (male n=13, female n=12), control group, n=27 (male n=15, female n=12)). Passive hip moments were calculated using an adapted force transducer during supine testing. A biomechanical model and predictive equation were used to calculate passive hip moments during walking. Total hip moments were calculated with the use of a 9 camera, 3-D motioncapture system.Findings: Independent samples t-tests demonstrated no significant differences between groups for gait parameters or hip or knee angles. Results of the ANOVAs demonstrated significant differences in passive hip flexor moments during the second half of hip flexion (P < 0.05).There were also significant differences in hip power and work done during peaks of power absorption and the second peak of power generation (P < 0.05). Interpretation: The present data demonstrates that subjects with low back pain have altered passive hip extensor and total power and work done during walking compared with healthy controls. Biomechanical models should include individual measurements of passive joint moments. © 2018, Elsevier. The attached document (embargoed until 14/10/2019) is an author produced version of a paper published in CLINICAL BIOMECHANICS uploaded in accordance with the publisher’s self- archiving policy. The final published version (version of record) is available online at the link below. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it.

U2 - 10.1016/j.clinbiomech.2018.10.012

DO - 10.1016/j.clinbiomech.2018.10.012

M3 - Article

VL - 60

SP - 134

EP - 140

JO - Clinical Biomechanics

JF - Clinical Biomechanics

ER -