Search for: lumbosacral-region
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    The effect of lumbosacral orthosis on the thickness of deep trunk muscles using ultrasound imaging: a randomized controlled trial in patients with chronic low back pain

    , Article American Journal of Physical Medicine and Rehabilitation ; Volume 98, Issue 7 , 2019 , Pages 536-544 ; 08949115 (ISSN) Azadinia, F ; Takamjani, I. E ; Kamyab, M ; Kalbassi, G ; Sarrafzadeh, J ; Parnianpour, M ; Sharif University of Technology
    Lippincott Williams and Wilkins  2019
    Objective This study was conducted to evaluate the changes occurring in the thickness of deep trunk muscles, measured using ultrasound imaging, after 4 wks of lumbosacral orthosis use in conjunction with routine physical therapy. Design This parallel-group, randomized, controlled trial was conducted on 44 patients with nonspecific chronic low back pain, randomly allocated to the experimental and control groups. Both groups received eight sessions of physical therapy twice per week for 4 wks. The experimental group wore nonextensible lumbosacral orthosis, in addition to undergoing routine physical therapy. The thickness of the transversus abdominis, obliquus internus, and lumbar multifidus... 

    A comprehensive approach for the validation of lumbar spine finite element models investigating post-fusion adjacent segment effects

    , Article Journal of Biomechanics ; Volume 121 , 2021 ; 00219290 (ISSN) Azadi, A ; Arjmand, N ; Sharif University of Technology
    Elsevier Ltd  2021
    Spinal fusion surgery is usually followed by accelerated degenerative changes in the unfused segments above and below the treated segment(s), i.e., adjacent segment disease (ASD). While a number of risk factors for ASD have been suggested, its exact pathogenesis remains to be identified. Finite element (FE) models are indispensable tools to investigate mechanical effects of fusion surgeries on post-fusion changes in the adjacent segment kinematics and kinetics. Existing modeling studies validate only their intact FE model against in vitro data and subsequently simulate post-fusion in vivo conditions. The present study provides a novel approach for the comprehensive validation of a lumbar... 

    Lumbopelvic rhythm during forward and backward sagittal trunk rotations: Combined in vivo measurement with inertial tracking device and biomechanical modeling

    , Article Clinical Biomechanics ; Vol. 29, issue. 1 , 2014 , pp. 7-13 ; ISSN: 02680033 Tafazzol, A ; Arjmand, N ; Shirazi-Adl, A ; Parnianpour, M ; Sharif University of Technology
    Background The ratio of total lumbar rotation over pelvic rotation (lumbopelvic rhythm) during trunk sagittal movement is essential to evaluate spinal loads and discriminate between low back pain and asymptomatic population. Methods Angular rotations of the pelvis and lumbar spine as well as their sagittal rhythm during forward flexion and backward extension in upright standing of eight asymptomatic males are measured using an inertial tracking device. The effect of variations in the lumbopelvic ratio during trunk flexion on spinal loads is quantified using a detailed musculoskeletal model. Findings The mean of peak voluntary flexion rotations of the thorax, pelvis, and lumbar was 121 (SD...