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Biplane radiography is a method of acquiring 3D, dynamic bone motion in vivo. Extracting kinematic output non-invasively requires an accurate 3D bone model that is often derived from a CT (high radiation exposure). Ultrashort echo time (UTE) or “CT-like” MRI offers a potential alternative to CT....
The relationship between countermovement jump (CMJ) performance and foot anthropometric measures were investigated. For women, a strong negative correlation existed¶ between foot length and CMJ performance as well as toe length and CMJ performance. This was not the case for men. These results highl...
There is a paucity of literature investigating the influence of foot strike posture on Achilles Tendon (AT) forces; a common site for lower limb overuse injuries. Fifteen male distance runners ran on an instrumented treadmill executing both, natural and imposed rearfoot (RFS) and forefoot (FFS) stri...
This study aims to determine the response of stroke survivors to user-driven treadmill control and functional electrical stimulation (FES) of their paretic ankle musculature. 14 stroke survivors walked at their self-selected (SS) and fast speeds on an instrumented treadmill in its fixed speed (FS) m...
Biomechanical interfaces can be improved by virtual prototyping, allowing an accurate prediction and optimization of subject-specific socket-skin pressure distribution. In this work we present a comparison between two different modelling approaches for socket prototyping of a transtibial amputee. Th...
Mechanical stimulus is one of the key factors that decide fate of chondrocytes in context of endochondral ossification. An osteochondral setup can be used to study the effect of mechanical stimulus on chondrocyte fate. In this paper, finite element models of the human knee joint and an osteochondral...
The goal of this study was to understand the mechanism of falls in the elderly using the complexity analysis of center of pressure (CoP) in those who fall and those who do not fall. Approximate Entropy (ApEn) was calculated to determine the levels of complexity of CoP during walking on an instrument...
The aim of this study was to investigate and evaluate the role of mechanical and neural modulations after stretch-shortening cycles (SSCs). Net ankle joint torque and H-reflexes of triceps surae were obtained during different tetanic contraction conditions, elicited by tibial nerve stimulation. Whil...
The relationship between coordination variability and running related overuse injuries has not been examined prospectively. Understanding this relationship will aid in identifying the loading effects of joint coordination on mechanically crucial musculoskeletal sites. Vector coding was used to deter...
Transtibial or below-knee prosthesis are known to have difficulty releasing heat, which can lead to prolonged, elevated residual limb skin temperatures inside the prosthesis and thermal discomfort. In this preliminary study, a thermal finite element analysis of a simplified, transtibial residual lim...
This study compared stride, thorax, and pelvis kinematics between accurate and inaccurate forehand (FH) and backhand (BH) lawn bowl deliveries. Kinematics were assessed of 19 elite lawn bowls athletes completing FH and BH deliveries. No relevant differences where shown between accurate and inaccurat...
We investigated whether the effects of ankle foot orthoses (AFOs) and AFO-tuning using incremented heel height is comparable between overground and treadmill walking in healthy adults. Results of this study indicate that small but consistent differences between treadmill and overground walking exist...
A bout of eccentric exercise confers protective effect against muscle damage after the same exercise performed several weeks later, which is known as the repeated bout effect (RBE). We investigated whether the RBE magnitude would be different between maximal voluntary contraction (MVC) torque and ra...
Heterogenous strain distribution within the Achilles tendon has been regarded as a main contributor of the overuse injuries and tendinopathy. Yet it is not possible to measure internal tissue stress/strain distribution in real time due to technical and computational difficulties. We present here a m...
Different foot types are associated with different biomechanical function [1]. In a cohort of cadets from West Point differences in foot type have already been observed across sex, race, injury incidence [2]. As part of their training to become officers in the US Army cadets train rigorously, especi...
The aim of this study was to compare the minimum and maximum values of gait patterns at different speeds predicted by two different methods: PEAK (based solely on the peak values), and CYCLE (based on the full gait cycle). We used gait data recorded at different speeds from a public repository as th...
Knee joints undergo various loading and unloading processes. Earlier investigations had a marginal focus on rate-dependent load response associated with viscoelastic and poromechanical behaviors of the joint. In this study, a fully meniscectomized porcine knee joint compression was simulated with a ...
Anatomical evidence points to the existence of 6-8 architecturally distinct partitions within the pectoralis major (PM), suggesting differential contributions of these partitions to humeral movement. This study investigated the activation of PM partitions using high-density electromyography in three...
This study compared the performance of five artificial neural networks in evaluating surface electromyography (sEMG) signal quality. AlexNet demonstrated the highest accuracy (99.55%) with negligible false classifications, indicating that sEMG quality evaluation can be automated via an image recogni...
Models that can predict the risk of herniation or re-herniation can aid in the development of surgical and rehabilitative treatments. Despite an abundance of computational spine models, there are none that have been specifically developed and validated to predict the risk of IVD herniation. Therefor...
Some people with partial foot amputation have shown calf muscle wastage after using fillers inside their footwear. This research aimed to investigate effects of fillers and footwear on individual calf muscle forces while walking at preferred speed. Gait data of two subjects with partial foot amputat...
Quantifying shoulder motion using body-worn inertial measurement units (IMUs) is not straight forward and requires addressing numerous challenges. We describe these challenges and use a sample data set to illustrate effects of protocol and algorithm choices on calculated shoulder angles. Finally, we...
The Hintegra® arthroplasty allows ankle movements at sagittal plane, and therefore contribute to restore gait. However, impairments still are observed after rehabilitation and could rely on neuromuscular activation. We determined the timing and amplitude of co-activation of the tibialis anterior an...
The aim of this study is to evaluate the influence of aging on the mechanical properties of the supraspinatus tendon, using Supersonic Shearwave Imaging (SSI) elastography. We evaluated 38 healthy individuals of both sexes, being 20 in the range of 20 to 35 years and 17 over 60 years old. The shear ...
The purpose of this study was to compare measures of gait temporo-spatial parameters of older adults walking outdoors collected using a GAITRite® instrumented mat and the IMU-based Xsens system. 10 older adults were evaluated during the gait in a public park. Velocity, cadence, step length, swing a...
Traumatic brachial plexus injuries (BPI) are debilitating and result in lifelong upper extremity dysfunction. Surgical restoration of motor function relies on salvageable nerves and muscles for transfer procedures. Kinematic data from subjects after a brachial plexus reconstruction was analysed duri...
A majority of physical activities which experience impacts during ground contact generate soft tissue vibrations. Those vibrations could potentially cause injury and energy lost due to high muscle tone associated with the vibration. Study has been reported the energy used by the muscles when exposed...
This study compared lower limb loading characteristics between individuals post-stroke and age-matched controls. Findings suggest that reduced joint angular displacement and delayed center of pressure control during limb loading may be important factors that contribute to functional deficits in weig...
Full body musculoskeletal models are of great interest due to their ability to capture a more accurate representation of human motion. Over time, full body models have grown in detail, although more work must be done. In this work, previously validated OpenSim models are combined to create a more de...
Foot insoles are frequently prescribed in routine clinical practice to prevent or treat foot deformities or functional alterations. Currently adopted procedures for foot insoles manufacturing vary among clinical practitioners and manufacturers and decisions are mainly left to the experience of the o...
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