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The purpose of the study was to verify the specificity of the proximal-distal sequence of the jump throw in handball. This phenomenon was observed from three different perspectives: (1) the sequence of the maximal linear velocities of the joints and ball, (2) the sequence of the initiation of the mo...
A better understanding of contact kinematics of the shoulder joint after total shoulder arthroplasty (TSA) may help identify causes of poor clinical outcomes following surgery [1]. In-vivo glenohumeral (GH) joint kinematics can be quantified from biplane fluoroscopic images using a 2D-3D image regis...
Forward somersault movements (FSMs) are very often used in gymnastics beam competitions. FSMs include four different movements (A, B, C, D) with increasingly difficulties. Twenty-one movements (9 A, 8 B, 3 C, 1 D) performed by national or international level gymnasts were recorded using high speed v...
It was proposed that muscle force is related to metabolic cost of gait. A knee exoskeleton, harvesting different amounts of energy, modulates the metabolic costs, during gait. We used musculoskeletal modelling and simulation to estimate muscle forces changes due to the energy harvesting levels. Mean...
To keep up with competitive footwear market nowadays, the progress in modeling and computational simulation is a promising solution for accelerating the product development time, and providing customized products. In this study, the effect of various tread pattern designs on traction performance dur...
In this study, a novel method for in vivo finger motion measurement was proposed. A six degree of freedom electromagnetic tracking system was used to prevent line of sight constraints. A novel landmark digitization method was used that provided accessible landmarks for in vivo use. The study involve...
Healthy populations are often assumed to have near identical movement patterns while asymmetry is commonly associated with pathology. Many current measures of symmetry are limited to discrete events, or involve high level mathematics that do not translate well to a clinical setting. The proposed Ave...
A systematic review and meta-analysis were performed to investigate neuromuscular changes after Tai Chi Practice. Healthy old Tai Chi practitioners demonstrated lower muscle latencies and longer muscle activation times during reaching tasks.
This study investigated EMG activation of the neuromuscular partitions of supraspinatus and infraspinatus during external rotation and abduction tasks against elastic resistance. Twenty-two participants completed dynamic arm movements using Therabandâ„¢ elastics while EMG activity from two partition...
We used a new experimental approach in a rabbit model to test for differences in the rate of force development among the individual quadriceps muscles and to assess their contribution to total torque during force development. We highlight that simultaneous and identical activation does not result in...
Modern CT devices now allow 3D geometrical measurements on the foot under load, finally giving access to the overall bone architecture in weight bearing. Previous measures were limited either by the 2D projection implied in the X-ray radiograms, or by the non-weight-bearing standard CT scans in supi...
In orthopaedic surgeries, evaluation and treatment planning are highly based on empirical evidence and clinical expertise of each surgeon. Furthermore, inter-subject anatomical variation is hardly considered in decision-making. Therefore, the aim of this study was to create a clinically applicable p...
Patients with shoulder subluxation often experience pain which limits arm functionality. In this paper we present a spring loaded shoulder orthosis which provides a joint-oriented force on the upper arm. Due to the type of springs and the location of the attachment points this force is always direct...
Machine learning was applied to whole-body kinematics collected during a standardized lifting task to predict lifting start and end height and weight lifted. The resulting models included features of the forearm and pelvis segments, and resulted in accurate classification rates between 83% and 98%.
Damage to the scapholunate interosseus ligament (SLIL) is one of the most disabling upper extremity injuries. Current diagnostic approaches for SLIL are invasive or lack the specificity to assess injury location. A better understanding of carpal bone kinematics following the SLIL injury may help to ...
Treadmills are of utmost importance in several fields of research. Treadmills can differ considerable in their dimension, motor power and belt velocity regulation [1]. Therefore, we developed a method that allows researchers to quantify instantaneous belt velocity quickly using motion capture techno...
Strength and balance exercises have already been shown to help improve stability, and thereby reduce the risk of falling in older adults. These exercises are often delivered face-to-face in a group class which is not always easy for older adults to attend. Compliance to prescription exercises at hom...
The absolute and normalized rate of torque development (RTD) of knee extensors were measured to investigate the interactions between angle-torque and angle-RTD relationships. Eighteen men performed maximal isometric explosive contraction (MIC) of knee extensors at the angles K, K-15°, K-30°, K+15Â...
Evaluating active translational shoulder stability is essential to quantifying clinically-relevant deficits in individuals with shoulder instability. Estimating impedance with random perturbations allows for this assessment of active translational stability that is not possible with clinical techniq...
The Plug in Gait model (PiG) is a commonly used biomechanical model for clinical gait. Recently, an open access alternative model to the PiG has been released for use. In considering the potential to transition to the new model, we are interested in comparing data calculated by the PiG and the new p...
This study aims to design a three-dimensional computational model to simulate walking for both able-bodied individuals and prosthesis users. The inverse dynamics model is driven using able-bodied gait kinematics. The model calculates the muscle forces required to produce the measured kinematics, bot...
We compared different devices (Force Plate {FP}, Inertial Measurement Units {IMU}, Pen-tail {Pen}) across related metrics of postural sway for the Clinical Test of Sensory Interaction and Balance (CTSIB).We found that Area of Ellipse Bounded (AoE B) and AoE eigenvalue (AoE E) were the most sensitive...
Existing stochastic models of slips depend on computing the probability that the required coefficient of friction (rCOF) exceeds the available coefficient of friction (aCOF). The result is an estimate of the probability of a slip. However, in some applications it is known that a slip has occurred an...
Characterisation of tendon mechanical properties is of importance to gain a comprehensive understanding of this tissue’s responses to ageing and loading and can also inform the development of artificial biomaterials based on living tissue data. In this study, we presented an innovative method of c...
There are several methods for computing average vertical loading rate (AVLR) in the literature. In this analysis we developed a novel method (the 3-12% auto method) and compared it to 2 methods of computation previously established in the literature (the 3-12% method and 20-80% method). The 3 method...
We developed and validated a novel rheological model of anterior cruciate ligament (ACL) loading. The ACL force (FACL) responses to cadaveric knee loading were interpolated using novel basis functions and cross-terms to account for observed non-additivity of uni-planar loading mechanisms. Resulting ...
We performed a pilot study that compares the following methods of visual biofeedback: filtering feedback, fading feedback, and multimodal feedback. We evaluate feedback performance by quantifying the transient response and steady state response of the subject to a new target step width. Transient st...
A continuously moving axis of rotation yields Achilles tendon moment arms that differ from those found using a single fixed axis derived from ankle motion, but those differences occur only at the dorsiflexion end of the range of motion.
The prevalence of shoulder pathology increases with age, but the progressive changes driving this pathology remain unknown. Identifying the changes preceding symptom onset may permit early detection and prevention of pathology. Altered strength and coordination are thought to contribute to tissue de...
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