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    Fatigue loaded intervertebral disc analysis for low back pain using nonlinear black-box model

    , Article IFMBE Proceedings ; Volume 39 , 2013 , Pages 513-517 ; 16800737 (ISSN) ; 9783642293047 (ISBN) Khan, M. F ; Malik, A. S ; Xia, L ; Nikkhoo, M ; Wang, J. L ; Parnianpour, M ; Humayun, J ; Sharif University of Technology
    2013
    Abstract
    This paper presents recent developments on effects of rest and fatigue loading on properties of healthy vertebra discs. A comparison of different approaches used in literature to study the properties of intervertebral disc is presented. The major achievements in this area so far are discussed in the context of their advantages and disadvantages. The past approaches are based on bio-mechanical models which mostly used statistical techniques for the analysis and estimation of fatigue loaded Intervertebral Disc (IVD). However, those modeling techniques were not flexible enough for analysis of customized tests. In this paper, we applied System Identification (SI) based NLARX modeling technique... 

    The Effect of Speed on Kinematic Variability and Dynamic Stability of Trunk in Subjects with and without Nonspecific Low back Pain during a Sagittal Repetitive Flexion Extension Movements

    , M.Sc. Thesis Sharif University of Technology Asgari, Morteza (Author) ; Parnianpour, Mohammad (Supervisor) ; Narimani, Rouya (Supervisor) ; Sanjari, Mohammad Ali (Co-Advisor)
    Abstract
    Low back pain is one the most prevalent disease and major economic issue facing modern countries. Epidemiological studies suggest that maximum trunk flexion, the angular velocity of trunk and the rate of repetitive movements (such as flexion-extension), are associated with low-back disorders. From biomechanical point of view, lack of stability during dynamic repetitive movements, increases the risk of injuries. On the other hand, some researchers suggest increasing motor variability could be an intrinsic factor to intervene muscuskeletal disorders during repetitive movements. Pace of repetitive occupational tasks could affect both, motor variability and dynamic stability. The goal of this... 

    The effect of chronic low back pain on trunk accuracy in a multidirectional isometric tracking task

    , Article Spine ; Vol. 39, Issue. 26 , 2014 , pp. E1608-E1615 ; ISSN: 1362-2436 Hadizadeh, M ; Mousavi, S. J ; Sedaghatnejad, E ; Talebian, S ; Parnianpour, M ; Sharif University of Technology
    Abstract
    Study Design. A cross-sectional study to quantify trunk motor control during multidirectional isometric tracking tasks.Objective. To investigate the effect of chronic low back pain (LBP) on trunk neuromuscular performance while participants performed isometric exertions of trunk muscles to track targets in different angles with various magnitudes.Summary of Background Data. Tracking tasks especially in multidirectional activities are among the common research methods to quantify human motor control in different conditions. However, little information is available on trunk motor control during these tasks. There is no study investigating trunk accuracy during multidirectional isometric... 

    Comparing lumbosacral orthosis to routine physical therapy on postural stability in patients with chronic low back pain: A randomized trial

    , Article Medical Journal of the Islamic Republic of Iran ; Volume 31 , 2017 ; 10161430 (ISSN) Azadinia, F ; Ebrahimi Takamjani, I ; Kamyab, M ; Parnianpour, M ; Asgari, M ; Sharif University of Technology
    Tehran University of Medical Sciences  2017
    Abstract
    Background: Poor balance performance and impaired postural control have been frequently reported in patients with low back pain.However, postural control is rarely monitored during the course of treatment even though poor postural control may contribute tochronicity and recurrence of symptoms. Therefore, the present study aimed at investigating the effect of a nonextensible lumbosacralorthosis (LSO) versus routine physical therapy on postural stability of patients with nonspecific chronic low back pain.Methods: This was a randomized controlled trial conducted between November 2015 and May 2016 at the outpatient physical therapyclinic of the School of Rehabilitation Sciences. Patients with... 

    EMG activity normalization for trunk muscles in subjects with and without back pain

    , Article Medicine and Science in Sports and Exercise ; Volume 34, Issue 7 , 2002 , Pages 1082-1086 ; 01959131 (ISSN) Ng, J.K.-F ; Kippers, V ; Parnianpour, M ; Richardson, C. A ; Sharif University of Technology
    American College of Sports Medicine  2002
    Abstract
    Purpose: The aims of the present study were to examine electromyographic (EMG) activity of six bilateral trunk muscles during maximal contraction in three cardinal planes and to determine the direction of contraction that gives maximal activation for each muscle, both for healthy subjects and back-pain patients. Methods: Twenty-eight healthy subjects and 15 back-pain patients performed maximum voluntary contractions in three cardinal planes. Surface EMG signals were recorded from rectus abdominis, external oblique, internal oblique, latissimus dorsi, iliocostalis lumborum, and multifidus bilaterally. Root mean square values of the EMG data were calculated to quantify the amplitude of EMG... 

    Test-retest reliabty of center of pressure measures of postural stability during quiet standing in a group with musculoskeletal disorders consisting of low back pain, anterior cruciate ligament injury and functional ankle instability

    , Article Gait and Posture ; Volume 29, Issue 3 , 2009 , Pages 460-464 ; 09666362 (ISSN) Salavati, M ; Hadian, M. R ; Mazaheri, M ; Negahban, H ; Ebrahimi, I ; Talebian, S ; Jafari, A. H ; Sanjari, M. A ; Sohani, S. M ; Parnianpour, M ; Sharif University of Technology
    2009
    Abstract
    Reliability is a population-specific property, but to the authors' knowledge there has been no study to determine the test-retest reliability of the postural stability measures such as center of pressure (COP) measures in the population of patients with musculoskeletal disorders (MSDs), while their clinical applications have been presented in literature. So, 33 patients with low back pain (LBP), anterior cruciate ligament (ACL) injury and functional ankle instability (FAI) randomly completed postural measurements with three levels of difficulty (rigid surface-eyes open, rigid surface-eyes closed, and foam surface-eyes closed) in two sessions. COP data were used to calculate standard... 

    Investigation of low back pain using system modeling

    , Article Advanced Science Letters ; Volume 19, Issue 5 , 2013 , Pages 1260-1264 ; 19366612 (ISSN) Khan, M. F ; Malik, A. S ; Xia, L ; Wang, J. L ; Nikkhoo, M ; Parnianpour, M ; Khan, M. I ; Sharif University of Technology
    2013
    Abstract
    This paper focuses on characterization of intervertebral disc behavior upon fatigue stress. It consists in in-vitro experiments to measure intervertebral disc deformation with regard to forces applied to produce fatigues test. In this paper, a system modeling based non-invasive method to assess back pain is proposed which may be used for designing of prediction model to predict the failure of intervertebral disc (IVD) experiencing fatigue loading. An artificial compression fracture was simulated in the lower level of vertebra followed by a poly(methyl methacrylate) (PMMA) bone cement injection. Fatigue loading was applied on the specimens and the load was incrementally increased form 650 N... 

    Multijoint coordination during sit-to-stand task in people with non-specific chronic low back pain

    , Article Biomedical Engineering - Applications, Basis and Communications ; Volume 25, Issue 1 , 2013 ; 10162372 (ISSN) Tajali, S ; Negahban, H ; Shaterzadeh, M. J ; Mehravar, M ; Salehi, R ; Narimani, R ; Parnianpour, M ; Sharif University of Technology
    2013
    Abstract
    Sit-to-stand (STS) is an important functional task affected by low back pain (LBP). It requires fundamental coordination among all segments of the body to control important performance variables such as body's center of mass (CM) and head positions. This study was conducted to determine whether LBPs could coordinate their multiple joints to achieve the task stability to the same extent as healthy controls. About 11 non-specific chronic LBP and 12 healthy control subjects performed STS task at three postural difficulty levels: rigid surface - open eyes (RO), rigid surface - closed eyes (RC) and narrow surface - closed eyes (NC). Motion variability of seven body segments, CM and head positions... 

    Effects of Low Back Pain and Posterior Lumbar Surgery on Pattern of Muscle Activities, Trunk Strength and Spinal Stability

    , M.Sc. Thesis Sharif University of Technology Ghiasi, Mohammad Sadegh (Author) ; Farahmand, Farzam (Supervisor) ; Arjmand, Navid (Co-Advisor)
    Abstract
    80% of people in all over the world, experience Low Back Pain (LBP) once in their lives. LBP leads to dysfunction of spine. About 25% of LBP relates to the intervertebral disks which in the critical cases, a Posterior Lumbar Surgery (PLS) on the one or more lumbar disks should be done. Due to the some procedure such as retracting, cutting or denervation of muscles, PLS can hurt trunk muscles and spine. Thus, investigation of LBP and postoperative complications of PLS can help us in recognition of causes of LBP and PLS complications and modification of PLS approaches. The objective of this research was investigation of effects of LBP and PLS on the biomechanical function of spine. Pattern of... 

    A Novel Algorithm to Diagnose Individuals with Low Back Pain and Cluster Analysis of Lumbar Movement Using Inertial Sensors

    , M.Sc. Thesis Sharif University of Technology Ashouri, Sajad (Author) ;
    Abstract
    Low back pain is the most prevalence musculoskeletal pain that people experience in their life. Some cases of low back pain are called non-specific. These are cases for which the reason of pain is not well defined. The aim of this study is to propose a simple approach to diagnose and cluster low back pain patients which helps clinicians to evaluate patients by an affordable and simple tool. In this study, data are collected in two steps using Inertial Sensors. Inertial Sensors consist of a 3-axis gyroscope and a 3-axis accelerometer which represent the kinematic parameters of lumbar movement. In the first step, we examine 24 healthy and 28 patients with low back pain and in the second, 84... 

    Effect of Lumbar and Soleus Proprioception on Kinematic Variability and Dynamic Stability of the Trunk and Center of Pressure Parameter in Healthy Individuals and Low Back Pain Patients

    , M.Sc. Thesis Sharif University of Technology Shokouhyan, Mohammad Reza (Author) ; Parnianpour, Mohammad (Supervisor) ; Hoviattalab, Maryam (Supervisor)
    Abstract
    Low Back Pain is one of the most problems in health domain which has a high treatment costs, also has high recurrence rates. Postural stability has been introduced as a health characteristic for musculoskeletal systems. Body stability is maintained with sensory feedback data such as Eyes, Vestibular and proprioception data which are sent to brain. Prior investigations have shown that proprioception data have many disorders in lumbar area of Low Back Pain patient and this data are not sent to brain encounters so many problems for muscle activation and stability of body. Researches have been indicated that Low Back Pain patients rely on Ankle proprioception more than healthy people and less... 

    Immediate effects of lumbosacral orthosis on postural stability in patients with low back pain: A preliminary study

    , Article Archives of Bone and Joint Surgery ; Volume 7, Issue 4 , 2019 , Pages 360-366 ; 23454644 (ISSN) Azadinia, F ; Ebrahimi Takamjani, I ; Kamyab, M ; Asgari, M ; Parnianpour, M ; Sharif University of Technology
    Mashhad University of Medical Sciences  2019
    Abstract
    Background: Lumbosacral orthosis (LSO) is commonly used for the treatment of back pain. The clinical and mechanical effectiveness of this device has been repeatedly investigated in several studies; however, its sensorimotor effectiveness has been rarely considered. Regarding this, the aim of the current study was to investigate the effect of a non-extensible LSO on postural stability (as a construct of sensorimotor function) in patients with nonspecific chronic low back pain (LBP). Methods: This preliminary study was conducted on 17 patients with nonspecific chronic LBP using a single-group quasi-experimental design. Postural stability was measured while the participants were placed in a... 

    Principal component analysis of kinematic patterns variability during sit to stand in people with non-specific chronic low back pain

    , Article Journal of Mechanics in Medicine and Biology ; Volume 12, Issue 2 , 2012 ; 02195194 (ISSN) Mehravar, M ; Tajali, S ; Negahban, H ; Shaterzadeh, M. J ; Salehi, R ; Narimani, R ; Parnianpour, M ; Sharif University of Technology
    2012
    Abstract
    Sit to stand (STS) task requires variability of all body segments to achieve the stability of the important control variables (i.e., center of mass (CM) and head positions). In this study, the possible differences in the variability patterns of various body segments were investigated between 11 chronic low back pain (LBP) and 12 control subjects during STS task through two types of variability analyses; first by calculating the variability of seven limb angles, CM and head positions across 15 trials and second by principal component analysis (PCA) of seven limb angles. Participants performed the task at 3 postural difficulty levels: rigid surface, open eyes (RO), rigid surface, close eyes... 

    The effects of postural difficulty conditions on variability of joint kinematic patterns during sit to stand task in normals and patients with non-specific chronic low back pain

    , Article 2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011, 21 February 2011 through 24 February 2011, Sharjah ; 2011 , Pages 300-303 ; 9781424470006 (ISBN) Tajali, S ; Negahban, H ; Yazdi, M. J. S ; Salehi, R ; Mehravar, M ; Parnianpour, M ; Sharif University of Technology
    2011
    Abstract
    Sit to stand (STS) is one of the most important activities of daily living that is shown to be affected in low back pain (LBP) patients. It requires a fundamental coordination action among all segments (DOFs) of the body in order to control important performance variables such as body's center of mass (CM) within base of support (BOS). In this study, possible differences in joint coordination and variability patterns between chronic LBP and healthy control subjects were investigated during STS task. Eleven adults with nonspecific chronic LBP and 12 healthy controls were recruited in the study. The participants performed the task in 3 exerimental conditions including: rigid surface, open eyes... 

    Postural sway in low back pain: Effects of dual tasks

    , Article Gait and Posture ; Volume 31, Issue 1 , 2010 , Pages 116-121 ; 09666362 (ISSN) Mazaheri, M ; Salavati, M ; Negahban, H ; Sanjari, M. A ; Parnianpour, M ; Sharif University of Technology
    2010
    Abstract
    Recurrence quantification analysis (RQA), a nonlinear method of postural analysis, was used to explore the effects of dual-tasking on postural performance in people with nonspecific low back pain (LBP) compared with healthy participants. Postural performance was quantified by RQA % recurrence, % determinism, entropy and trend. People with nonspecific LBP (n = 22) and unimpaired individuals (n = 22) randomly performed quiet standing tasks with three levels of difficulty (rigid-surface eyes open, rigid-surface eyes closed and foam-surface eyes closed). These tasks were performed in isolation or concurrently with an easy or difficult cognitive task. Increasing postural difficulty was associated... 

    Trunk coordination in healthy and chronic nonspecific low back pain subjects during repetitive flexion-extension tasks: Effects of movement asymmetry, velocity and load

    , Article Human Movement Science ; Volume 45 , 2016 , Pages 182-192 ; 01679457 (ISSN) Mokhtarinia, H. R ; Sanjari, M. A ; Chehrehrazi, M ; Kahrizi, S ; Parnianpour, M ; Sharif University of Technology
    Elsevier 
    Abstract
    Multiple joint interactions are critical to produce stable coordinated movements and can be influenced by low back pain and task conditions. Inter-segmental coordination pattern and variability were assessed in subjects with and without chronic nonspecific low back pain (CNSLBP). Kinematic data were collected from 22 CNSLBP and 22 healthy volunteers during repeated trunk flexion-extension in various conditions of symmetry, velocity, and loading; each at two levels. Sagittal plane angular data were time normalized and used to calculate continuous relative phase for each data point. Mean absolute relative phase (MARP) and deviation phase (DP) were derived to quantify lumbar-pelvis and... 

    Effect of dual-tasking on postural control in subjects with nonspecific low back pain

    , Article Spine ; Volume 34, Issue 13 , 2009 , Pages 1415-1421 ; 03622436 (ISSN) Salavati, M ; Mazaheri, M ; Negahban, H ; Ebrahimi, I ; Jafari, A. H ; Kazemnejad, A ; Parnianpour, M ; Sharif University of Technology
    2009
    Abstract
    STUDY DESIGN. Three factors mixed-design with 1 between-subject and 2 within-subject factors. OBJECTIVE. To compare the main effects and interactions of postural and cognitive difficulty on quiet stance between subjects with and without nonspecific low back pain (LBP). SUMMARY OF BACKGROUND DATA. The interference between postural control and cognitive tasks depends on factors such as sensorimotor/cognitive integrity. Changes in peripheral sensory and muscular systems as well as cognitive processes have been observed in LBP patients. It was hypothesized that the effect of cognitive task on postural performance might be different in subjects with nonspecific LBP as compared with healthy... 

    Comparison of Stabilization Exercise and General Exercise on the Spinal Stability of Non-specific Low Back Pain Patients Using an EMG-based Biomechanical Model

    , M.Sc. Thesis Sharif University of Technology Ghezelbash, Farshid (Author) ; Arjmand, Navid (Supervisor) ; Parnianpour, Mohamad (Supervisor)
    Abstract
    Low back pain is one of the musculoskeletal diseases which is an important issue for general health of society in both quality of life and costs. Most of the clinical instructions employ exercise as a clinical treatment in order to cure chronic low back pain. General and core stability exercises are of common prevalence, however, there are disputes about the effectiveness of these exercises in the literature. The aim of this study is to answer the question whether stabilizer exercise can significantly alter the stability of vertebral column in comparison with general exercises. Hence, experiments have been designed and conducted. The participants have been divided to two group. Within six... 

    Effect of Obesity on Spinal Loads during Various Activities: A Combined in Vivo-Modeling Approach

    , M.Sc. Thesis Sharif University of Technology Kazemi, Hossein (Author) ; Arjmand, Navid (Supervisor) ; Parnianpour, Mohammad (Supervisor)
    Abstract
    Obesity is a worldwide growing health challenge affecting ~30% of the world's population. Increased rate of disc degeneration and herniation, low back pain and surgery has been reported in obese individuals. Although obesity-related low back diseases have multifactorial etiology, presumably greater mechanical loads on the spine of heavier individuals during their daily activities may be considered as a risk factor. Likely larger trunk muscle sizes, disc sizes and thus passive stiffness in heavier individuals may however partly or fully offset the effect of their additional body weight on the spinal loads. In absence of in vivo approaches, the present study aims to construct subject-specific... 

    Effect of Obesity on Spinal Loads during Various Activities: A Combined in Vivo-Modeling Approach

    , M.Sc. Thesis Sharif University of Technology Akhavanfar, Mohammad Hossein (Author) ; Arjmand, Navid (Supervisor)
    Abstract
    Obesity is a worldwide growing health challenge affecting ~30% of the world's population. Increased rate of disc degeneration and herniation, low back pain and surgery has been reported in obese individuals. Although obesity-related low back diseases have multifactorial etiology, presumably greater mechanical loads on the spine of heavier individuals during their daily activities may be considered as a risk factor. Likely larger trunk muscle sizes, disc sizes and thus passive stiffness in heavier individuals may however partly or fully offset the effect of their additional body weight on the spinal loads. In absence of in vivo approaches, the present study aims to construct subject-specific...