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Full-length radiograph based automatic musculoskeletal modeling using convolutional neural network J. Biomech. (IF 2.4) Pub Date : 2024-03-09 Junqing Wang, Shiqi Li, Zitong Sun, Qicheng Lao, Bin Shen, Kang Li, Yong Nie
Full-length radiographs contain information from which many anatomical parameters of the pelvis, femur, and tibia may be derived, but only a few anatomical parameters are used for musculoskeletal modeling. This study aimed to develop a fully automatic algorithm to extract anatomical parameters from full-length radiograph to generate a musculoskeletal model that is more accurate than linear scaled one
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Jumping towards field-based ground reaction force estimation and assessment with OpenCap J. Biomech. (IF 2.4) Pub Date : 2024-03-09 Jasper Verheul, Mark A. Robinson, Sophie Burton
Low-cost and field-viable methods that can simultaneously assess external kinetics and kinematics are necessary to enhance field-based biomechanical monitoring. The aim of this study was to determine the accuracy and usability of ground reaction force (GRF) profiles estimated from segmental kinematics, measured with OpenCap (a low-cost markerless motion-capture system), during common jumping movements
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The study of loading mode with in-vitro fatigue testing for mitral annuloplasty ring J. Biomech. (IF 2.4) Pub Date : 2024-03-08 Hui Zuo, Wentao Feng, Xiaolan Tang, Zhou Li, Yubo Fan
To maintain the physiological dynamics of the mitral annulus, mitral annuloplasty rings (MAR) must be flexible. Enhanced flexibility implies decreased resistance to fatigue and potential for fatigue fracture. This study established new methods to test the flexible fatigue life of MAR in-vitro using numerical analysis; the purpose is that the fatigue test could reflect the real stress distribution in-vivo
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Notes on the margin of stability J. Biomech. (IF 2.4) Pub Date : 2024-03-08 Carolin Curtze, Tom J.W. Buurke, Christopher McCrum
The concept of the 'extrapolated center of mass (XcoM)', introduced by Hof et al., (2005, J. Biomechanics 38 (1), p. 1–8), extends the classical inverted pendulum model to dynamic situations. The vector quantity XcoM combines the center of mass position plus its velocity divided by the pendulum eigenfrequency. In this concept, the margin of stability (MoS), i.e., the minimum signed distance from the
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Altered foot placement modulation with somatosensory stimulation in people with chronic stroke J. Biomech. (IF 2.4) Pub Date : 2024-03-07 Ethan B. Schonhaut, Keith E. Howard, Camden J. Jacobs, Heather L. Knight, Alyssa N. Chesnutt, Jesse C. Dean
Many individuals who experience a stroke exhibit reduced modulation of their mediolateral foot placement, an important gait stabilization strategy. One factor that may contribute to this deficit is altered somatosensory processing, which can be probed by applying vibration to the involved muscles (e.g., the hip abductors). The purpose of this study was to investigate whether appropriately controlled
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Gastrocnemius medialis and Achilles tendon properties do not differ between children with unilateral or bilateral spastic cerebral palsy J. Biomech. (IF 2.4) Pub Date : 2024-03-07 Andreas Habersack, Martin Svehlik, Bernhard Guggenberger, Markus Tilp, Annika Kruse
Spastic cerebral palsy (SCP) is a common neurodevelopmental disorder in children, which can be categorized into unilateral and bilateral subtypes. Most studies examining the muscle-tendon properties of the lower extremities in individuals with SCP do not distinguish between subtypes. However, spastic muscle morphology is an important determinant for its function. Therefore, differences in muscle-tendon
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The impact of backpack load on adolescent’s stair descent gait J. Biomech. (IF 2.4) Pub Date : 2024-03-03 Zijun Lu, Chuangui Mao, Yuanyuan Tan, Tao Liu, Xinglu Li, Zhengao Li, Wenfei Zhu, Yuliang Sun
This study investigates the impact of increasing backpack load on the gait of adolescents during stair descent. Sixteen healthy male students (age = 12.9 ± 0.6 years) were required to descend the stairs in 4 loaded conditions. The kinematic, kinetic, and EMG data were collected synchronously and gait parameters, especially indicators of balance control, were analyzed. The posterior tilt angles (COM-COP
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Markerless gait analysis through a single camera and computer vision J. Biomech. (IF 2.4) Pub Date : 2024-02-28 Hanwen Wang, Bingyi Su, Lu Lu, Sehee Jung, Liwei Qing, Ziyang Xie, Xu Xu
The assessment of gait performance using quantitative measures can yield crucial insights into an individual's health status. Recently, computer vision-based human pose estimation has emerged as a promising solution for markerless gait analysis, as it allows for the direct extraction of gait parameters from videos. This study aimed to compare the lower extremity kinematics and spatiotemporal gait parameters
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Prepared for landing: A simple activation strategy scales muscle force to landing height J. Biomech. (IF 2.4) Pub Date : 2024-02-24 Nicolai Konow, Thomas J. Roberts
Before landing from a jump or fall, animals preactivate muscles to stiffen their limb joints but it is unclear how muscles tune limb stiffness and how collision forcefulness is anticipated. We measured electromyography and force from the lateral gastrocnemius muscle during landings in turkeys, an animal model that allows for direct measurements of muscle force. Many studies of landings in humans and
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Musculoskeletal model degrees of Freedom: Frontal plane constraints are hindering our understanding of human movement J. Biomech. (IF 2.4) Pub Date : 2024-02-24 Hunter J. Bennett PhD, Joshua T. Weinhandl PhD, Zachary A. Sievert PhD
Induced acceleration analyses have expanded our understanding on the contributions of muscle forces to center of mass and segmental kinematics during a myriad of tasks. While these techniques have identified a subset of major muscle that contribute to locomotion, most analyses have included models with only one frontal plane degree of freedom (dof) actuated by the hip joint. The purpose of this study
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Biomechanical comparison of composite and cadaveric humeri models in experiments on operated humeral shaft fractures J. Biomech. (IF 2.4) Pub Date : 2024-02-24 Patricia R. Melvin, Benjamin M. Wheatley, Patrick J. Schimoler, Alexander Kharlamov, Mark C. Miller, John J. Elias, Gregory T. Altman
A study was undertaken to determine how well contacting fracture fragments of composite bone replicated the behavior of fracture fragments in real bone. Ten composite and ten real humeral diaphyses were transected and reconstructed with limited-contact dynamic-compression plates. Two screws were placed on each side of the transection site and a calibrated electronic sensor sheet was placed between
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Impact of variations in swimming velocity on wake flow dynamics in human underwater undulatory swimming J. Biomech. (IF 2.4) Pub Date : 2024-02-24 Yusaku Nakazono, Hirofumi Shimojo, Yasuo Sengoku, Hideki Takagi, Takaaki Tsunokawa
Increasing the velocity of the lower-limb movement is crucial for improving underwater undulatory swimming (UUS) velocity. However, the underlying mechanism of how these movements influence swimming velocity have remained unclear. This study aimed to clarify the relationship between changes in swimming movement and the resulting changes in flow field as a result of changes in test flow velocity ()
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Association between fat and fat-free body mass indices on shock attenuation during running J. Biomech. (IF 2.4) Pub Date : 2024-02-24 Bernard X.W. Liew, Xuqi Zhu, Xiaojun Zhai, Stuart A. McErlain-Naylor, Christopher McManus
High amplitudes of shock during running have been thought to be associated with an increased injury risk. This study aimed to quantify the association between dual-energy X-ray absorptiometry (DEXA) quantified body composition, and shock attenuation across the time and frequency domains. Twenty-four active adults participated. A DEXA scan was performed to quantify the fat and fat-free mass of the whole-body
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Development of a head-weighted injury criterion for evaluation of multiple types of AIS 4+ injuries for vulnerable road users J. Biomech. (IF 2.4) Pub Date : 2024-02-23 Yong Han, He Wu, Di Pan, Liang Su, Liangliang Shi, Fang Wang
Vulnerable Road users (VRUs) often suffer multiple fatal head injury types simultaneously in road accidents. In this study, a head-weighted injury criterion (HWIC) was proposed for assessing the risk of head AIS 4+ injuries considering multiple injury types. Firstly, the kinematic characteristics of VRUs in the 50 in-depth accidents were reconstructed by using multi-body system models, and head injuries
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Scapular motion during shoulder joint extension movement J. Biomech. (IF 2.4) Pub Date : 2024-02-23 Takanao Shirai, Tomohito Ijiri, Toshiaki Suzuki
A few reports on scapular motion during shoulder joint extension exist. Understanding the normal motion of shoulder joint extension may be useful in evaluating and treating patients with diminished or minimal shoulder joint extension. Therefore, this study aimed to identify scapular motion during shoulder joint extension movement in a sitting position. Shoulder joint extension movement in the sitting
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Shear shock wave injury in vivo: High frame-rate ultrasound observation and histological assessment J. Biomech. (IF 2.4) Pub Date : 2024-02-22 Sandhya Chandrasekaran, Francisco Santibanez, Tyler Long, Tim Nichols, Jason Kait, Ruth Vorder Bruegge, Cameron R. ‘Dale’ Bass, Gianmarco Pinton
Using high frame-rate ultrasound and ¡1 sensitive motion tracking we previously showed that shear waves at the surface of and brains develop into shear shock waves deep inside the brain, with destructive local accelerations. However post-mortem tissue cannot develop injuries and has different viscoelastodynamic behavior from tissue. Here we present the ultrasonic measurement of the high-rate shear
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Effects of running skill and speed on limb coordination during submaximal and maximal sprinting J. Biomech. (IF 2.4) Pub Date : 2024-02-22 Tyler D. Whitacre, David J. Stearne, Kenneth P. Clark
In locomotion, the relative phasing of the limbs changes with speed and provides valuable insight to neuromuscular control of gait. At present, it is unknown if individuals trained in sprinting coordinate their limbs differently than runners from other athletic backgrounds. Therefore, we aimed to characterize the effects of speed and skill on lower limb coordination. Twenty-five physically active (PA)
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Biomechanical behavior of the lower limbs and of the joints when landing from different heights J. Biomech. (IF 2.4) Pub Date : 2024-02-22 Thibaut D. Toussaint, Bénédicte Schepens
Landing from a jump is a challenging task as the energy accumulated during the aerial phase of the jump must be fully dissipated by the lower limbs during landing; the higher the jump height, the greater the amount of energy to be dissipated. In the present study, we aim to understand (1) how the biomechanical behavior is tuned as a function of the mechanical demand, and (2) the relationship between
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Subject-specific material properties of the heel pad: An inverse finite element analysis J. Biomech. (IF 2.4) Pub Date : 2024-02-22 Vara Isvilanonda, Ellen Y. Li, Evan D. Williams, Peter R. Cavanagh, David R. Haynor, Baocheng Chu, William R. Ledoux
Individuals with diabetes are at a higher risk of developing foot ulcers. To better understand internal soft tissue loading and potential treatment options, subject-specific finite element (FE) foot models have been used. However, existing models typically lack subject-specific soft tissue material properties and only utilize subject-specific anatomy. Therefore, this study determined subject-specific
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Dynamic assessment of spine movement patterns using an RGB-D camera and deep learning J. Biomech. (IF 2.4) Pub Date : 2024-02-22 Jessica Wenghofer, Kristen HE Beange, Wantuir C Ramos, Matthew P Mavor, Ryan B Graham
In clinical practice, functional limitations in patients with low back pain are subjectively assessed, potentially leading to misdiagnosis and prolonged pain. This paper proposes an objective deep learning (DL) markerless motion capture system that uses a red–green–blue-depth (RGB-D) camera to measure the kinematics of the spine during flexion–extension (FE) by 1) the development and validation of
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Development of an implantable trapezium carpal bone replacement for measuring in vivo loads at the base of the thumb J. Biomech. (IF 2.4) Pub Date : 2024-02-21 Joseph J. Crisco, Julia A. Henke, Daniel G. McDermott, Rohit Badida, Amy M. Morton, Josephine M. Kalshoven, Douglas C. Moore
Understanding the loads that occur across musculoskeletal joints is critical to advancing our understanding of joint function and pathology, implant design and testing, as well as model verification. Substantial work in these areas has occurred in the hip and knee but has not yet been undertaken in smaller joints, such as those in the wrist. The thumb carpometacarpal (CMC) joint is a uniquely human
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Does crouch alter the effects of neuromuscular impairments on gait? A simulation study J. Biomech. (IF 2.4) Pub Date : 2024-02-21 Elijah C. Kuska, Katherine M. Steele
Cerebral palsy (CP) is a neurologic injury that impacts control of movement. Individuals with CP also often develop secondary impairments like weakness and contracture. Both altered motor control and secondary impairments influence how an individual walks after neurologic injury. However, understanding the complex interactions between and relative effects of these impairments makes analyzing and improving
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Agreement between a markerless and a marker-based motion capture systems for balance related quantities J. Biomech. (IF 2.4) Pub Date : 2024-02-21 Anaïs Chaumeil, Bhrigu Kumar Lahkar, Raphaël Dumas, Antoine Muller, Thomas Robert
Balance studies usually focus on quantities describing the global body motion. Assessing such quantities using classical marker-based approach can be tedious and modify the participant’s behaviour. The recent development of markerless motion capture methods could bypass the issues related to the use of markers. This work compared dynamic balance related quantities obtained with markers and videos.
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Corrigendum to “Constant force muscle stretching induces greater acute deformations and changes in passive mechanical properties compared to constant length stretching” [J. Biomech. 154 (2023) 111594] J. Biomech. (IF 2.4) Pub Date : 2024-02-20 G. Geusebroek, J.H. van Dieën, M.J.M. Hoozemans, W. Noort, H. Houdijk, H. Maas
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Use of a factor analysis to assess biomechanical factors of American Sign Language in native and non-native signers J. Biomech. (IF 2.4) Pub Date : 2024-02-20 Joshua Pataky, Emily C. Demalis, Jonathan Shelly, Kara Miller, Zoe M. Moore, Meghan E. Vidt
Prior studies suggest that native (born to at least one deaf or signing parent) and non-native signers have different musculoskeletal health outcomes from signing, but the individual and combined biomechanical factors driving these differences are not fully understood. Such group differences in signing may be explained by the five biomechanical factors of American Sign Language that have been previously
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Corrigendum to “Muscle-tendon unit design and tuning for power enhancement, power attenuation, and reduction of metabolic cost” [J. Biomech. 153 (2023) 111585] J. Biomech. (IF 2.4) Pub Date : 2024-02-19 N.C. Holt, D.L. Mayfield
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Review of state-of-the-art micro and macro-bioreactors for the intervertebral disc J. Biomech. (IF 2.4) Pub Date : 2024-02-19 Jonathan P. McKinley, Grace D. O'Connell
Lower back pain continues to be a global epidemic, limiting quality of life and ability to work, due in large part to symptomatic disc degeneration. Development of more effective and less invasive biological strategies are needed to treat disc degeneration. In vitro models such as macro- or micro-bioreactors or mechanically active organ-chips hold great promise in reducing the need for animal studies
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Skin marker-based versus bone morphology-based coordinate systems of the hindfoot and forefoot J. Biomech. (IF 2.4) Pub Date : 2024-02-18 Chantal M Hulshof, Wouter Schallig, Josien C van den Noort, Geert J Streekstra, Roeland P Kleipool, Johannes GG Dobbe, Mario Maas, Jaap Harlaar, Marjolein M van der Krogt
Segment coordinate systems (CSs) of marker-based multi-segment foot models are used to measure foot kinematics, however their relationship to the underlying bony anatomy is barely studied. The aim of this study was to compare marker-based CSs (MCSs) with bone morphology-based CSs (BCSs) for the hindfoot and forefoot. Markers were placed on the right foot of fifteen healthy adults according to the Oxford
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Biomechanical analysis of complications following T10-Pelvis spinal fusion: A population based computational study J. Biomech. (IF 2.4) Pub Date : 2024-02-16 Austin Q. Nguyen, Christian Rodriguez, Rachit Kumar, Sachin Gupta, Dennis E. Anderson, Comron Saifi
Proximal junctional kyphosis (PJK) and proximal junctional failure (PJF) are challenging complications of long fusion constructs for the treatment of adult spinal deformity. The objective of this study is to understand the biomechanical stresses proximal to the upper instrumentation of a T10-pelvis fusion in a large patient cohort. The pre-fusion models were subject-specific thoracolumbar spine models
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Influence of vortical structures on fibrin clot formation in cerebral aneurysms: A two-dimensional computational study J. Biomech. (IF 2.4) Pub Date : 2024-02-16 Tinashe Ngwenya, Divan Grundlingh, Malebogo N. Ngoepe
Thrombosis is an important contributor to cerebral aneurysm growth and progression. A number of sophisticated multiscale and multiphase models have been developed with a view towards interventional planning. Many of these models are able to account for clotting outcomes, but do not provide detailed insight into the role of flow during clot development. In this study, we present idealised, two-dimensional
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The role of the nucleus pulposus in intervertebral disc recovery: Towards improved specifications for nucleus replacement devices J. Biomech. (IF 2.4) Pub Date : 2024-02-15 K. Raftery, T. Rahman, N. Smith, T. Schaer, N. Newell
Nucleus replacement devices (NRDs) have potential to treat degenerated or herniated intervertebral discs (IVDs). However, IVD height loss is a post-treatment complication. IVD height recovery involves the nucleus pulposus (NP), but the mechanism of this in response to physiological loads is not fully elucidated. This study aimed to characterise the non-linear recovery behaviour of the IVD in intact
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Open the pores – Polydimethylsiloxane influences the porous structure of cancellous bone surrogates for biomechanical testing of osteosyntheses J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Marianne Hollensteiner, Sabrina Sandriesser, Peter Augat
Synthetic materials used for valid and reliable implant testing and design should reflect the mechanical and morphometric properties of human bone. Such bone models are already available on the market, but they do not reflect the population variability of human bone, nor are they open-celled porous as human bone is. Biomechanical studies aimed at cementing the fracture or an implant cannot be conducted
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Strategies to optimise machine learning classification performance when using biomechanical features J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Bernard X.W. Liew, Florian Pfisterer, David Rügamer, Xiaojun Zhai
Building prediction models using biomechanical features is challenging because such models may require large sample sizes. However, collecting biomechanical data on large sample sizes is logistically very challenging. This study aims to investigate if modern machine learning algorithms can help overcome the issue of limited sample sizes on developing prediction models. This was a secondary data analysis
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The importance of foot posture when recording lower leg electromyography when walking in non-textured and textured foot orthoses J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Kelly A. Robb, Stephen D. Perry
Foot posture describes the anatomical variance in an individual’s overall foot shape, an important consideration in the provision of foot orthoses. Current orthoses designs could be optimized by considering the topographical organization of cutaneous mechanoreceptors. Currently, the effect of foot orthoses designs to enhance skin stimulation across different anatomical foot posture remains unknown
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Guidelines for balancing the number of trials and the number of subjects to ensure the statistical power to detect variability – Implication for gait studies J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Masahiro Shinya, Ken Takiyama
Variability is one of the most crucial outcomes in human movement studies: variance and standard deviation of various parameters have been reported in numerous studies. However, in many of these studies, the numbers of trials and subjects have been intuitively determined and not justified with statistical considerations. Here, we investigated the impact of the numbers of trials and subjects on statistical
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Time-varying and speed-matched model for the evaluation of stroke-induced changes in ankle mechanics J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Yueling Lyu, Kaifan Xie, Xiyao Shan, Yan Leng, Le Li, Xianyi Zhang, Rong Song
The ankle mechanics (stiffness and moment) are modulated continuously when interacting with the environment during human walking. However, it remains unclear how ankle mechanics vary with walking speeds, and how they are affected by stroke. This study aimed to determine time-varying ankle stiffness and moment in stroke participants during walking, comparing them with healthy participants at matched
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Effect of midsole hardness and surface type cushioning on landing impact in heel-strike runners J. Biomech. (IF 2.4) Pub Date : 2024-02-15 Zihan Yang, Chuyi Cui, Zhipeng Zhou, Zhiyi Zheng, Songhua Yan, Hui Liu, Feng Qu, Kuan Zhang
High loading impact associated with heel strikes causes running injuries. This study aimed to investigate how loading impact is affected by midsole hardness and running surface type. Twelve young rear-foot runners ran at a fixed speed along an 18 m runway wearing shoes with different midsole hardness (Asker C-45, C-50, C-55, C-60, from soft to hard) and on two different surfaces (rubber and concrete)
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Sprint resisted swimming training effect on the swimmer’s hand orientation angles J. Biomech. (IF 2.4) Pub Date : 2024-02-13 Ioannis Valkoumas, Vassilios Gourgoulis
The current study aimed to determine the effect of an 11-week sprint resisted swimming training programme on the swimming performance and the orientation angles of the hand. Fourteen young female swimmers were divided into two equivalent groups and were trained with specific sprint training sets. The experimental group performed these sets using a swimming parachute. For the evaluation of the intervention
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Measurement of the active drag coefficient in front-crawl: A stroke-by-stroke analysis J. Biomech. (IF 2.4) Pub Date : 2024-02-11 Jorge E. Morais, Daniel A. Marinho, Tiago M. Barbosa
The purpose of this study was to understand the change in active drag coefficient (C) over successive stroke cycles in front-crawl and the relationship between swimming speed and C. Eighteen national competitive swimmers (nine girls and nine boys with a mean age of 14.91 ± 0.59 years) were recruited. Swimming speed, propulsion (F) and frontal surface area were measured to calculate the C. Swimming
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Is an ellipsoid surface suitable to model the scapulothoracic sliding plane? J. Biomech. (IF 2.4) Pub Date : 2024-02-10 Y. Blache, F. Lefebvre, I. Rogowski, B. Michaud, M. Begon
Closed loop kinematic chain approaches are commonly used to assess scapular kinematics but with heterogeneous ellipsoid calibration procedures. This study aimed to assess whether an ellipsoid surface can model the scapulothoracic sliding plane and determine the optimal number of static poses to calibrate the ellipsoid parameters. An intracortical pin with a rigid cluster of four reflective markers
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In vivo chronic scaffolding force of a resorbable magnesium scaffold J. Biomech. (IF 2.4) Pub Date : 2024-02-09 Christoph Forkmann, Martin Pritsch, Philine Baumann-Zumstein, Daniel Lootz, Michael Joner
The aim of this study is to qualitatively characterize the in vivo chronic scaffolding force of the Magmaris® Resorbable Magnesium Scaffold (RMS). This important parameter of scaffolds must be balanced between sufficient radial support during the healing period of the vessel and avoidance of long-term vessel caging. A finite element model was established using preclinical animal data and used to predict
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Electromyography-driven musculoskeletal models with time-varying fatigue dynamics improve lumbosacral joint moments during lifting J. Biomech. (IF 2.4) Pub Date : 2024-02-08 Mohamed Irfan Mohamed Refai, Alejandro Moya-Esteban, Massimo Sartori
Muscle fatigue is prevalent across different aspects of daily life. Tracking muscle fatigue is useful to understand muscle overuse and possible risk of injury leading to musculoskeletal disorders. Current fatigue models are not suitable for real-world settings as they are either validated using simulations or non-functional tasks. Moreover, models that capture the changes to muscle activity due to
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Time to stability of treadmill running kinematics in novel footwear with different midsole thickness J. Biomech. (IF 2.4) Pub Date : 2024-02-04 Max R. Paquette, Jake A. Melaro, Ross Smith, Isabel S. Moore
Running studies, particularly those examining footwear effects, commonly use warm-up or familiarization periods prior to testing. There is no consensus for how long these familiarization periods should be to ensure stable running kinematics prior to experimental testing in novel footwear. The aim of this study was to assess the time to stability of kinematic variables during treadmill running in novel
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Evaluation of ground reaction forces and centers of pressure predicted by AnyBody Modeling System during load reaching/handling activities and effects of the prediction errors on model-estimated spinal loads J. Biomech. (IF 2.4) Pub Date : 2024-02-03 S. Daroudi, N. Arjmand, M. Mohseni, M. El-Rich, M. Parnianpour
Full-body and lower-extremity human musculoskeletal models require feet ground reaction forces (GRFs) and centers of pressure (CoPs) as inputs to predict muscle forces and joint loads. GRFs/CoPs are traditionally measured via floor-mounted forceplates that are usually restricted to research laboratories thus limiting their applicability in real occupational and clinical setups. Alternatively, GRFs/CoPs
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Modeling the effects of hydration on viscoelastic properties of nucleus pulposus tissue in shear using the fractional Zener model J. Biomech. (IF 2.4) Pub Date : 2024-02-03 Megan Co, Chelsea Pack, Zachary Osborn-King, Brian Raterman, Arunark Kolipaka, Sarah A. Bentil, Benjamin A. Walter
Nucleus pulposus (NP) tissue in the intervertebral disc (IVD) is a viscoelastic material exhibiting both solid- and fluid-like mechanical behaviors. Advances in viscoelastic models incorporating fractional calculus, such as the Fractional Zener (FZ) model, have potential to describe viscoelastic behaviors. The objectives of this study were to determine whether the FZ model can accurately describe the
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Stride-to-stride fluctuations and temporal patterns of muscle activity exhibit similar responses during walking to variable visual cues J. Biomech. (IF 2.4) Pub Date : 2024-02-03 João R. Vaz, Nelson Cortes, João Sá Gomes, Sofia Jordão, Nick Stergiou
Incorporating variability within gait retraining approaches has been proposed and shown to lead to positive changes. Specifically, submitting the individuals to walk in synchrony to cues that are temporally organized with a fractal-like patterns, promotes changes at the stride-to-stride fluctuations closer to those typically find in young adults. However, there is still a need to understand the underlying
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A novel computational workflow to holistically assess total knee arthroplasty biomechanics identifies subject-specific effects of joint mechanics on implant fixation J. Biomech. (IF 2.4) Pub Date : 2024-02-03 Jonathan D. Glenday, Jonathan M. Vigdorchik, Peter K. Sculco, Cynthia A. Kahlenberg, David J. Mayman, Eytan M. Debbi, Joseph D. Lipman, Timothy M. Wright, Fernando J. Quevedo González
Computational studies of total knee arthroplasty (TKA) often focus on either joint mechanics (kinematics and forces) or implant fixation mechanics. However, such disconnect between joint and fixation mechanics hinders our understanding of overall TKA biomechanical function by preventing identification of key relationships between these two levels of TKA mechanics. We developed a computational workflow
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Comparing spinal loads in individuals with unilateral transtibial amputation with and without chronic low back pain: An EMG-informed approach J. Biomech. (IF 2.4) Pub Date : 2024-02-02 Courtney M. Butowicz, Pawel R. Golyski, Julian C. Acasio, Brad D. Hendershot
Chronic low back pain (cLBP) is highly prevalent after lower limb amputation (LLA), likely due in part to biomechanical factors. Here, three-dimensional full-body kinematics and kinetics during level-ground walking, at a self-selected and three controlled speeds (1.0, 1.3, and 1.6 m/s), were collected from twenty-one persons with unilateral transtibial LLA, with (n = 9) and without cLBP (n = 12). Peak
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Conventional video recordings dependably quantify whole-body lifting strategy using the Stoop-Squat-Index: A methods comparison against motion capture and a reliability study J. Biomech. (IF 2.4) Pub Date : 2024-02-02 Christian Bangerter, Oliver Faude, Patric Eichelberger, Annina Schwarzentrub, Milène Girardin, Aglaja Busch, Carol-Claudius Hasler, Stefan Schmid
Whole-body lifting strategies could be derived from conventional video recordings using the Stoop-Squat-Index, which quantifies the ratio between trunk forward lean and lower extremity joint flexion from 0 (full squat) to 100 (full stoop). The purpose of this study was to compare Stoop-Squat-Indices derived from conventional video recordings to those from a three-dimensional marker-based motion capture
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On the relation between gait speed and gait cycle duration for walking on even ground J. Biomech. (IF 2.4) Pub Date : 2024-02-01 Jakob Ziegler, Hubert Gattringer, Andreas Müller
Gait models and reference motions are essential for the objective assessment of walking patterns and therapy progress, and research in the field of wearable robotics and rehabilitation devices in general. A human can achieve a desired gait speed by adjusting stride length and/or stride frequency. It is hypothesized that sex, age, and physique of a person have a significant influence on the combination
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Analysis of frictional forces in experimental models of stent retriever mechanical thrombectomy J. Biomech. (IF 2.4) Pub Date : 2024-02-01 Omar N. Elkhayyat, Michael T. Froehler, Bryan C. Good
Acute ischemic stroke (AIS) and mechanical thrombectomy (MT) are commonly studied using cerebral artery models made of nonbiological materials. However, these models often report higher recanalization rates than those observed clinically, suggesting a discrepancy between experimental models and clinical settings. We believe this may be partly due to the frictional interactions between blood clots,
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Selective dorsal rhizotomy and its effect on muscle force during walking: A comprehensive study J. Biomech. (IF 2.4) Pub Date : 2024-02-01 Emiliano Pablo Ravera, Adam Rozumalski
Selective dorsal rhizotomy (SDR) is commonly used to permanently reduce spasticity in children with cerebral palsy (CP). However, studies have yielded varying results regarding muscle strength and activity after SDR. Some studies indicate weakness or no changes, while a recent study using NMSK simulations demonstrates improvements in muscle forces during walking. These findings suggest that SDR may
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Investigation into the two-way interaction of coronary flow and heart function in coronary artery disease predicted by a computational model of autoregulation of coronary flow J. Biomech. (IF 2.4) Pub Date : 2024-02-01 Hossein Ramezani Kharvani, Cyrus Aghanajafi
This study presents a closed-loop computational model to investigate the interplay between heart function, coronary flow, and systemic circulation during exercise, with a specific focus on the impact of coronary artery stenosis. The model incorporates a lumped representation of the heart, main arteries, and coronary arteries, establishing a closed circulatory system. The simulation investigates the
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Machine learning applications in spine biomechanics J. Biomech. (IF 2.4) Pub Date : 2024-02-01 Farshid Ghezelbash, Amir Hossein Eskandari, Xavier Robert-Lachaine, Shufan Cao, Mehran Pesteie, Zhuohua Qiao, Aboulfazl Shirazi-Adl, Christian Larivière
Spine biomechanics is at a transformation with the advent and integration of machine learning and computer vision technologies. These novel techniques facilitate the estimation of 3D body shapes, anthropometrics, and kinematics from as simple as a single-camera image, making them more accessible and practical for a diverse range of applications. This study introduces a framework that merges these methodologies
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Predicting cervico-thoraco-lumbar vertebra positions from cutaneous markers: Combining local frame and postural predictors improves robustness to posture J. Biomech. (IF 2.4) Pub Date : 2024-02-01 A. Tomezzoli, A. Agouram, B. Chalamet, J-B. Pialat, S. Duprey, V. Cunin, B. Fréchède
Predictions of vertebra positions from external data are required in many fields like motion analysis or for clinical applications. Existing predictions mainly cover the thoraco-lumbar spine, in one posture. The objective of this study was to develop a method offering robust vertebra position predictions in different postures for the whole spine, in the sagittal plane. EOS radiographs were taken in
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Active control of static pedal force direction decreases maximum isometric force output J. Biomech. (IF 2.4) Pub Date : 2024-01-23 Franziska Onasch, Walter Herzog
Perfect mechanical force effectiveness in cycling would be achieved if the forces applied to the pedal were perpendicular to the crank throughout the full crank cycle. However, empirical observations show that resultant pedal forces display substantial radial components in recreational and even highly-trained elite cyclists. Therefore, we hypothesized that attempting to maximize mechanical effectiveness
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In vivo load on knee, hip and spine during manual materials handling with two lifting techniques J. Biomech. (IF 2.4) Pub Date : 2024-01-26 Alwina Bender, Hendrik Schmidt, Daniela L. Wellner, Georg N. Duda, Christopher Brandl, Philipp Damm
It is generally accepted that the lifting technique strongly influences physical loads within the human body and, thus, the risk of musculoskeletal disorders. However, there is a lack of knowledge regarding whether particular lifting techniques are effective in reducing loads. Hence, this retrospective study quantified (partly published) in vivo loads at joints within the human body during two typical
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Android obesity could be associated with a higher fall risk than gynoid obesity following a standing-slip: A simulation-based biomechanical analysis J. Biomech. (IF 2.4) Pub Date : 2024-01-26 Jiyun Ahn, Rebecca Ban, Caroline Simpkins, Feng Yang
It is well recognized that overall obesity increases fall risk. However, it remains unknown if the obesity-induced increase in the fall risk depends upon the adipose distribution (or obesity type: android vs. gynoid). This pilot study examined the effects of fat deposition region on fall risk following a standing-slip trial in young adults with simulated android or gynoid adiposity. Appropriate external