Journal of biomechanics最新文献_第10页

The effect of bone relaxation on the simulated pull-off force of a cementless femoral knee implant

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-23 DOI: 10.1016/j.jbiomech.2025.112528

Thomas Gersie , Thom Bitter , Robert Freeman , Nico Verdonschot , Dennis Janssen

Aseptic loosening is the primary cause of revision in cementless total knee arthroplasty (TKA), emphasizing the importance of strong initial stability for long-term implant success. Pre-clinical evaluations are crucial for understanding implant fixation mechanics and improving implant designs. Finite element (FE) analysis models often use linear elastic bone material models, which do not accurately reflect bone’s mechanical behavior. Incorporating a von Mises yield model to simulate bone’s plastic behavior improved predictions of primary stability but tends to overestimate fixation, potentially due to neglecting bone viscoelasticity. Stress relaxation in bone can affect primary stability by reducing press-fit forces on implants. This study aimed to include bone relaxation into FE models of femoral TKA reconstructions to investigate the impact of bone material models on primary fixation. Simulated pull-off tests were conducted using three material models: elastic, plastic, and plastic-viscoelastic. Six femoral reconstructions, previously used in another study, were included. The average pull-off force decreased (about 79%) from 31 kN with the elastic model to 6.3 kN when bone plasticity was included. Introducing stress relaxation showed a minimal effect, leading to an additional reduction in pull-off force of 0.8%. A significant positive correlation was found between bone mineral density and pull-off force across the three material models. Additionally, elastic strain energy within the femur correlated strongly with pull-off force, suggesting higher strain energy increases pull-off force. This study is the first to integrate plastic and viscoelastic bone behavior in FE simulations, offering insights into cementless implant fixation within context of realistic bone mechanics.

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引用次数: 0

Comparison between the fluid–structure interaction approach and the finite element method approach to analyze the leaflet flutter in bioprosthetic aortic valve

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-23 DOI: 10.1016/j.jbiomech.2025.112532

Matheus Carvalho Barbosa Costa , Saulo de Freitas Gonçalves , João Victor Curado Fleury , Mário Luis Ferreira da Silva , Rudolf Huebner , Artur Henrique de Freitas Avelar

The low durability of bioprosthetic heart valves (BHV), between 10-15 years, is associated with the development of leaflets flutter. Despite increasing calcification and structural damage of the BHV, leaflets flutter is an understudied condition. Therefore, the objective of this study is compare the oscillation characteristics of BHV leaflets obtained by the finite element method (FEM) technique and by the fluid-structural interaction (FSI) technique. A BHV geometry and a simplified fluid domain were developed. Physiological ventricular and aortic pressure were applied in the FEM and FSI simulations. The BHV were considered with incompressible hyperelastic and isotropic mechanical behavior, while the blood was modeled as a Newtonian fluid. Turbulence was modeled according to the k –

ω

SST model. The displacement and maximum principal stress results showed that the FSI approach was in better agreement with the in vitro studies in the literature. Furthermore, the leaflet vibration frequency was 12 times lower and the amplitude 50 times higher compared to the FEM method. From the stress distribution in the leaflets, the highest values occurred in the commissure region of the ventricular side for both techniques. In addition, while the stress was more uniform for FEM, FSI showed a stress concentration in the belly region of the leaflets. This study indicates that the use of the FEM technique to assess fatigue intensification due to leaflet fluttering could induce inaccurate conclusions, since it does not incorporate the dynamic fluid impacts on leaflets.

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引用次数: 0

Muscle contributions to propelling the body upward differ between skipping and running 跳远和跑步时，肌肉对推动身体向上的贡献不同。

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112545

Sarah A. Roelker , John D. Willson , Paul DeVita , Richard R. Neptune

Skipping represents a training alternative to running due to its lower knee contact forces and higher whole-body metabolic cost. The increased metabolic cost of skipping is associated with a higher vertical center-of-mass (COM) displacement during the support and flight phases of the skipping hop compared to running. However, skipping has lower muscle force impulses than running. Therefore, the study purpose was to compare the flow of mechanical power between body segments during skipping and running to determine the mechanisms enabling higher vertical displacement in skipping despite the lower vertical impulse. Running and skipping cycles were simulated in OpenSim for 5 adults (22.4 ± 2.2 y) using motion capture data collected at 2.5 m/s on an instrumented dual-belt treadmill. A segmental power analysis quantified muscle contributions to vertical body segment mechanical power, which were integrated over the stance phase of running (Run) and the hop (Skip 1) and step (Skip 2) of skipping to calculate mechanical work. Higher vertical work was done by the gluteus maximus, vasti, and soleus in Skip 1, primarily through power generation to the trunk, compared to power absorption in Run and Skip 2. Thus, despite lower muscle force impulses in Skip 1, muscles generate power through concentric contractions, leading to greater metabolic cost than in running. These muscle force impulses contribute to propelling the COM upward in Skip 1 (rather than decelerating downward COM motion in Run and Skip 2), which raises the COM and contributes to the greater COM displacement in skipping compared to running.

由于膝关节接触力较小，全身代谢成本较高，因此跳绳是跑步训练的替代选择。与跑步相比，跳绳在支撑和飞行阶段的垂直重心（COM）位移更高，这与跳绳代谢成本的增加有关。然而，与跑步相比，跳绳的肌肉力量冲动较低。因此，研究的目的是比较跳绳和跑步过程中身体各部分之间的机械动力流，以确定尽管跳绳的垂直冲力较低，但却能产生较高垂直位移的机制。利用在带仪器的双带跑步机上以 2.5 米/秒的速度采集的运动捕捉数据，在 OpenSim 中模拟了 5 名成人（22.4 ± 2.2 岁）的跑步和跳绳循环。分段力量分析量化了肌肉对垂直身体分段机械力量的贡献，并对跑步（Run）的站立阶段和跳远（Skip 1）的跳跃阶段以及跳远（Skip 2）的迈步阶段进行了整合，以计算机械功。与 "跑 "和 "跳 2 "中的力量吸收相比，在 "跳 1 "中，臀大肌、比目鱼肌和比目鱼肌的垂直功更高，主要是通过对躯干的力量产生。因此，尽管蛙跳 1 中的肌肉力脉冲较低，但肌肉通过同心收缩产生力量，导致代谢成本高于跑步。这些肌肉力脉冲有助于在跳1中推动COM向上运动（而不是在跑和跳2中使COM向下运动减速），从而提高COM，并导致跳远时COM位移比跑步时更大。

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引用次数: 0

Estimation of the effects of hand growth on muscle activation patterns: A musculoskeletal modeling study

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112544

Miranda C. Ludovice , Katherine R. Saul , Derek G. Kamper

Throughout childhood growth and development, both the nervous and the musculoskeletal systems undergo rapid change. The goal of this study was to examine the impact of growth-related changes in skeletal size and muscle strength on the neural control of finger force generation. By modifying an existing OpenSim hand model in accordance with pediatric anthropometric data, we created 10 distinct models representing males and females at each year of development from 6 to 10 years old. We then used the static optimization tool to estimate the requisite muscle activations to create a maximal palmar force with the index finger in two different postures (metacarpophalangeal, proximal interphalangeal, distal interphalangeal) − Posture 1: (0°, 30°, 0°) and Posture 2: (0°, 60°, 30°). For Posture 1, multiple regression analysis revealed a significant effect of both age and sex on activation for all muscles (p < 0.035) with exception of the flexor digitorum profundus. For Posture 2, only the extensor digitorum communis activation had a significant relationship with age (p = 0.010), while no other muscles showed a significant relationship with age, sex, or the age-sex interaction activation (p > 0.054). Exchanging the activation patterns between the youngest and oldest models altered both the predicted index finger force and direction. Therefore, our simulations suggest that the changes in hand size and morphology associated with growth may necessitate changes in muscle activation patterns to be able to continue to perform a given hand function. Children may need to substantially adjust or even relearn motor control strategies throughout childhood.

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引用次数: 0

Three-dimensional kinematics in patients with anterior shoulder instability – A systematic review with meta-analysis

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112543

Talissa Oliveira Generoso , Vitor La Banca , Felipe F. Gonzalez , João Artur Bonadiman , Lucas Valerio Pallone , Eliane C. Guadagnin , Grant E. Garrigues , Jonathan A. Gustafson , Leonardo Metsavaht , Gustavo Leporace

Anterior Shoulder Instability (ASI) is a common orthopedic condition often resulting in altered shoulder kinematics. Understanding the biomechanics of the unstable shoulder is critical to determine the most appropriate treatment. This study aims to conduct the first systematic review and meta-analysis of three-dimensional (3D) shoulder kinematic studies in ASI patients. A broad search was conducted within PubMed, Scopus, and Cochrane Library following the PRISMA guidelines. All cross-sectional or longitudinal studies with 3D motion analysis describing shoulder kinematics in patients with ASI were included. The quality of each study was assessed using the MINORS criteria. Qualitative and quantitative analyses were performed. Nine studies were included in the qualitative analysis and two in the meta-analysis. The qualitative review detected conflicting evidence for some parameters. The humeral head had a greater anterior translation in unstable shoulders in three of the studies analyzed, while the difference was not significant in one and another found higher variability for global humeral translation for instability patients. Two studies showed decreased rotation range of motion for unstable shoulders while one did not find significant differences. Conflicting results were also found regarding changes in scapulohumeral rhythm and scapular orientation. The meta-analysis indicated a greater scapulohumeral rhythm on the coronal plane for the instability group, suggesting a relatively greater contribution of motion at the glenohumeral joint compared with the scapulothoracic joint for arm abduction, and reduced glenohumeral peak angles for unstable shoulders. Identifying and quantifying kinematic changes associated with ASI are vital for refining treatment interventions.

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引用次数: 0

Biomechanical correlates of gait and stair climbing are associated with ex vivo cartilage quality in gonarthrotic patients

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112546

Ramona Ritzmann , Jochen Paul , Jürg Gasser , Janine Kuch , Yufei Li , Ines Honorio , Agnese Beretta-Picoli , Arno Doelemeyer , Angelika Meyer , Lukas Hils , Stefan Utzinger , Albrecht Heitner , Carsten Jacobi , Christoph Centner

Previous evidence highlights the important role of knee joint malalignment and excessive joint moments for the development to knee osteoarthritis. The present study aimed to systematically investigate the interrelationship between three-dimensional knee kinematics during walking and stair climbing and ex-vivo electromechanical measured cartilage quality in 119 patients with end-stage knee osteoarthritis. Patients scheduled for total knee arthroplasty surgery underwent radiographic assessment and biomechanical analysis in gait and stair climbing assessing in vivo knee joint angles and moments during movement dynamics prior to surgery. Electromechanical properties of the excised tibial cartilage as an indicator of cartilage quality were evaluated using Arthro-BST. Peak knee adduction angle was found to be a significant predictor of medial cartilage quality during walking (R² = 22 %, p < 0.001) and stair climbing (R² = 13 %, p < 0.001). During walking, knee flexion moment was found to be a strong predictor of medial (R² = 9 %, p = 0.002) and lateral cartilage quality (R² = 12 %, p < 0.001). Knee adduction (R² = 19 %, p < 0.001) and abduction angles (R² = 44 %, p < 0.01) during x-ray was significantly associated with dynamic assessments during 3D kinematics. Medial joint space width significantly predicted medial tibial cartilage quality (R² = 16 %, p < 0.001).

The results showed that biomechanical parameters such as varus malalignment during walking and stair climbing are significantly associated with tibial cartilage deterioration and contribute to a variance explanation of 13–22%.

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引用次数: 0

Hemodynamic investigations on the portal hypertension and treatment of transjugular intrahepatic portosystemic shunt (TIPS) based on CFD simulation

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112516

Wenzhi Gao , Chunzhen Yin , Chunze Zhou , Delei Cheng , Jian Chen , Changhai Liu , Yishan Zeng

Hemodynamic processes from the portal vein(PV) to the inferior vena cava(IVC) were mimicked for three patients with portal hypertension(PH) and the effects of stent parameters on the outcomes of transjugular intrahepatic portosystemic shunt(TIPS) were investigated through computational fluid dynamics(CFD). The liver region was simulated with porous media model and the spatial distributions of superior mesenteric vein(SMV) and splenic vein(SV) blood were solved through the Eulerian multiphase model. The present method is able to simulate the PH flow and predict the PV pressure, the stent shunt rate and the SMV blood proportion after TIPS treatment. According to the CFD results, the stent diameter exerts dominant effects on the TIPS outcomes while the stent placement shows substantial effects on the TIPS outcomes. Energy loss of the TIPS stents and distributary effects of the PV bifurcation dominate the PV hemodynamics and the TIPS outcomes. For stents with large diameter or proper placement, the energy loss is low therefore the PV pressure reduction and stent shunt rate are high. Stents inserted on the left and right branches of the PV are able to utilize distributary effects of the PV bifurcation therefore reduce the SMV blood flowing into the IVC.

{"title":"Hemodynamic investigations on the portal hypertension and treatment of transjugular intrahepatic portosystemic shunt (TIPS) based on CFD simulation","authors":"Wenzhi Gao , Chunzhen Yin , Chunze Zhou , Delei Cheng , Jian Chen , Changhai Liu , Yishan Zeng","doi":"10.1016/j.jbiomech.2025.112516","DOIUrl":"10.1016/j.jbiomech.2025.112516","url":null,"abstract":"<div><div>Hemodynamic processes from the portal vein(PV) to the inferior vena cava(IVC) were mimicked for three patients with portal hypertension(PH) and the effects of stent parameters on the outcomes of transjugular intrahepatic portosystemic shunt(TIPS) were investigated through computational fluid dynamics(CFD). The liver region was simulated with porous media model and the spatial distributions of superior mesenteric vein(SMV) and splenic vein(SV) blood were solved through the Eulerian multiphase model. The present method is able to simulate the PH flow and predict the PV pressure, the stent shunt rate and the SMV blood proportion after TIPS treatment. According to the CFD results, the stent diameter exerts dominant effects on the TIPS outcomes while the stent placement shows substantial effects on the TIPS outcomes. Energy loss of the TIPS stents and distributary effects of the PV bifurcation dominate the PV hemodynamics and the TIPS outcomes. For stents with large diameter or proper placement, the energy loss is low therefore the PV pressure reduction and stent shunt rate are high. Stents inserted on the left and right branches of the PV are able to utilize distributary effects of the PV bifurcation therefore reduce the SMV blood flowing into the IVC.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"Article 112516"},"PeriodicalIF":2.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anticipation augments distal leg muscle neuromechanics before, during, and after treadmill-induced perturbations applied during walking

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-21 DOI: 10.1016/j.jbiomech.2025.112547

Emily K. Eichenlaub , Jessica Allen , Vicki S. Mercer , Jeremy R. Crenshaw , Jason R. Franz

We investigated the effect of anticipation on the proactive and reactive neuromechanical responses of the distal leg muscles in 20 young adults to anticipated and unanticipated rapid anterior or posterior treadmill-induced balance perturbations applied during walking. We quantified local medial gastrocnemius (MG) and tibialis anterior (TA) neuromechanics using cine B-mode ultrasound and surface electromyography before, during, and after the perturbation. Our findings partially supported the hypothesis that anticipated perturbations would elicit greater proactive agonist muscle adjustments than unanticipated perturbations. Though, these adjustments were direction-dependent; MG showed greater activation in anticipation of accelerations while TA activation did not change in anticipation of decelerations. Our findings contradicted our second hypothesis that unanticipated perturbations would elicit larger reactive agonist muscle responses than anticipated perturbations. Anticipated perturbations elicited greater agonist muscle excitations with no changes in muscle fascicle kinematics during the perturbed and recovery strides, suggesting that anticipation allows for greater force responsiveness of distal leg muscles when disrupted by a perturbation. Our results may inform remote monitoring of stability and balance using portable measurement tools, such as EMG and ultrasound, to monitor muscle dynamics in real time and mitigate the risk of falls.

{"title":"Anticipation augments distal leg muscle neuromechanics before, during, and after treadmill-induced perturbations applied during walking","authors":"Emily K. Eichenlaub , Jessica Allen , Vicki S. Mercer , Jeremy R. Crenshaw , Jason R. Franz","doi":"10.1016/j.jbiomech.2025.112547","DOIUrl":"10.1016/j.jbiomech.2025.112547","url":null,"abstract":"<div><div>We investigated the effect of anticipation on the proactive and reactive neuromechanical responses of the distal leg muscles in 20 young adults to anticipated and unanticipated rapid anterior or posterior treadmill-induced balance perturbations applied during walking. We quantified local medial gastrocnemius (MG) and tibialis anterior (TA) neuromechanics using cine B-mode ultrasound and surface electromyography before, during, and after the perturbation. Our findings partially supported the hypothesis that anticipated perturbations would elicit greater proactive agonist muscle adjustments than unanticipated perturbations. Though, these adjustments were direction-dependent; MG showed greater activation in anticipation of accelerations while TA activation did not change in anticipation of decelerations. Our findings contradicted our second hypothesis that unanticipated perturbations would elicit larger reactive agonist muscle responses than anticipated perturbations. Anticipated perturbations elicited greater agonist muscle excitations with no changes in muscle fascicle kinematics during the perturbed and recovery strides, suggesting that anticipation allows for greater force responsiveness of distal leg muscles when disrupted by a perturbation. Our results may inform remote monitoring of stability and balance using portable measurement tools, such as EMG and ultrasound, to monitor muscle dynamics in real time and mitigate the risk of falls.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"Article 112547"},"PeriodicalIF":2.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143065876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Motor variability regulation analysis in trampolinists

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-21 DOI: 10.1016/j.jbiomech.2025.112533

Mathieu Bourgeois , Eve Charbonneau , Craig Turner, Mickaël Begon

In trampolining, optimizing body orientation during landing reduces injury risk and enhances performance. As trampolinists are subject to motor variability, anticipatory inflight corrections are necessary to regulate their body orientation before landing. We investigated the evolution of a) body orientation and b) limb position (i.e., arms and legs) variabilities. Secondary objectives were to investigate c) the link between acrobatics difficulty and the variability accumulation, and d) to identify links between body orientation variability and gaze orientation. Kinematics and gaze orientation were captured using inertial measurement units and an eye tracker, respectively. Seventeen trampolinists performed up to 13 different acrobatics (different number of rotations in twist and somersault). Intra-trampolinist pelvis orientation and limb position inter-trial variability was computed for each acrobatic at three key timestamps: takeoff, 75 % completion of the twist, and landing. Pelvis orientation variability significantly increased between takeoff and the instant when 75 % of the twist is completed (+75 %) and then decreased from the instant when 75 % of the twist is completed until landing (−39 %). Conversely, limb variability decreased (upper limbs: −66 % and lower limbs: −46 %), before increasing (+357 % and +127 %), suggesting that trampolinists adapted their limb kinematics to regulate pelvis orientation before landing. It was qualitatively observed that this decrease in body orientation variability occurred mostly when trampolinists were looking at the trampoline bed before landing. In addition, there was a moderate correlation between the number of twists in a straight somersault and the variability accumulation at 75 % of the twist, highlighting that trampolinists accumulate more variability as the number of twist rotations increases.

{"title":"Motor variability regulation analysis in trampolinists","authors":"Mathieu Bourgeois , Eve Charbonneau , Craig Turner, Mickaël Begon","doi":"10.1016/j.jbiomech.2025.112533","DOIUrl":"10.1016/j.jbiomech.2025.112533","url":null,"abstract":"<div><div>In trampolining, optimizing body orientation during landing reduces injury risk and enhances performance. As trampolinists are subject to motor variability, anticipatory inflight corrections are necessary to regulate their body orientation before landing. We investigated the evolution of a) body orientation and b) limb position (<em>i.e.</em>, arms and legs) variabilities. Secondary objectives were to investigate c) the link between acrobatics difficulty and the variability accumulation, and d) to identify links between body orientation variability and gaze orientation. Kinematics and gaze orientation were captured using inertial measurement units and an eye tracker, respectively. Seventeen trampolinists performed up to 13 different acrobatics (different number of rotations in twist and somersault). Intra-trampolinist pelvis orientation and limb position inter-trial variability was computed for each acrobatic at three key timestamps: takeoff, 75 % completion of the twist, and landing. Pelvis orientation variability significantly increased between takeoff and the instant when 75 % of the twist is completed (+75 %) and then decreased from the instant when 75 % of the twist is completed until landing (−39 %). Conversely, limb variability decreased (upper limbs: −66 % and lower limbs: −46 %), before increasing (+357 % and +127 %), suggesting that trampolinists adapted their limb kinematics to regulate pelvis orientation before landing. It was qualitatively observed that this decrease in body orientation variability occurred mostly when trampolinists were looking at the trampoline bed before landing. In addition, there was a moderate correlation between the number of twists in a straight somersault and the variability accumulation at 75 % of the twist, highlighting that trampolinists accumulate more variability as the number of twist rotations increases.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"Article 112533"},"PeriodicalIF":2.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143038534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Difference in movement coordination and variability during Five-Repetition Sit-to-Stand between people with and without Chronic Low back pain

IF 2.4 3区医学 Q3 BIOPHYSICS

Journal of biomechanics

Pub Date : 2025-01-19 DOI: 10.1016/j.jbiomech.2025.112531

Dhananjaya Sutanto , Cheuk Yin Ho , Stephen H.S. Wong , Adrian Pranata , Yijian Yang

Chronic low back pain (CLBP) affects people’s activities of daily living, including sitting down and standing up. Movement pattern analyses during five-repetition sit-to-stand (5RSTS) may allow CLBP status differentiation. 44 CLBP and 22 asymptomatic participants performed 5RSTS in this study, with their trunk and lower limb movements recorded using 3-dimensional motion capture system. Joint active range of motion, joint maximal velocity, joint and segment continuous relative phase (CRP) were analyzed. Mean absolute relative phase (MARP) and deviation phase (DP) variables were calculated in CRP analysis. Between-group kinematic variables were compared using One-way Multivariate Analysis of Covariance (MANCOVA). Significant variables from different methods were compared using binomial logistic regression to assess accuracy for CLBP status. Results showed that segmental CRP is the most sensitive method for CLBP assessment, with the CLBP group femur-to-pelvis and lumbar-to-pelvis movement coordination was more in-phase MARP (F(8,56) = 7.127, p < 0.001, Wilks’Λ = 0.441, ηp² = 0.559) and stable DP (F(8,56) = 4.585, p < 0.001, Wilks’Λ = 0.551, ηp² = 0.449) during both standing up and sitting down. Utilizing CRP variables yielded Nagelkerke R² = 0.708 and overall correct classification of 93 % for CLBP status. Individuals with CLBP exhibited distinct movement coordination and stability, which should be considered in CLBP assessments and intervention. Variable combination from the segment analysis was found to be the most predictive to CLBP status, and significantly different to the results obtained from joint analysis, highlighting the necessity for CRP method standardization in future studies.

{"title":"Difference in movement coordination and variability during Five-Repetition Sit-to-Stand between people with and without Chronic Low back pain","authors":"Dhananjaya Sutanto , Cheuk Yin Ho , Stephen H.S. Wong , Adrian Pranata , Yijian Yang","doi":"10.1016/j.jbiomech.2025.112531","DOIUrl":"10.1016/j.jbiomech.2025.112531","url":null,"abstract":"<div><div>Chronic low back pain (CLBP) affects people’s activities of daily living, including sitting down and standing up. Movement pattern analyses during five-repetition sit-to-stand (5RSTS) may allow CLBP status differentiation. 44 CLBP and 22 asymptomatic participants performed 5RSTS in this study, with their trunk and lower limb movements recorded using 3-dimensional motion capture system. Joint active range of motion, joint maximal velocity, joint and segment continuous relative phase (CRP) were analyzed. Mean absolute relative phase (MARP) and deviation phase (DP) variables were calculated in CRP analysis. Between-group kinematic variables were compared using One-way Multivariate Analysis of Covariance (MANCOVA). Significant variables from different methods were compared using binomial logistic regression to assess accuracy for CLBP status. Results showed that segmental CRP is the most sensitive method for CLBP assessment, with the CLBP group femur-to-pelvis and lumbar-to-pelvis movement coordination was more in-phase MARP (F(8,56) = 7.127, p < 0.001, Wilks’Λ = 0.441, ηp<sup>2</sup> = 0.559) and stable DP (F(8,56) = 4.585, p < 0.001, Wilks’Λ = 0.551, ηp<sup>2</sup> = 0.449) during both standing up and sitting down. Utilizing CRP variables yielded Nagelkerke R<sup>2</sup> = 0.708 and overall correct classification of 93 % for CLBP status. Individuals with CLBP exhibited distinct movement coordination and stability, which should be considered in CLBP assessments and intervention. Variable combination from the segment analysis was found to be the most predictive to CLBP status, and significantly different to the results obtained from joint analysis, highlighting the necessity for CRP method standardization in future studies.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"Article 112531"},"PeriodicalIF":2.4,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143038951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0