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Studies have shown that risk of noncontact injury largely depends on knee abduction (KA) at the time of injury, with Anterior Cruciate Ligament (ACL) injuries occurring at significantly larger KA than the KA at initial contact with the ground [2]. The goal of this study was to assess whether the Max...
Kinematics of the prosthetic tibiotalar joint in total ankle replacement (TAR) patients have yet to be measured using dual fluoroscopy (DF). These data could improve our clinical understanding of failures in TAR patients, leading to better surgical approaches and implant designs. With dual fluorosco...
This study aimed to develop a model to predict ice hockey shot puck trajectory based on the initial puck launch vectors and aerodynamic variables. Using motion capture data collected from wrist and slap shots executed within an ice arena, a puck’s position and orientation was tracked from release ...
Inertial measurement units (IMUs) provide an alternative to traditional data collection methods such as motion capture and force plates which can only be used in limited environments and populations. IMUs also enable the collection of more genuine movement patterns in a natural environment outside t...
We investigated changes in joint mechanics and metabolic rate due to walking with the trunk inclined at different angles. Participants walked with trunk angles from -15 to +60 deg. Metabolic rate increased with both forward and backward trunk angle, confirming that people habitually walk near the me...
Deformability of the foot and thicknesses of lower extremity muscles were measured and kinetic/kinematic analyses of normal shod walking were done on children and adults. Children showed higher relative navicular drop and smaller peroneus longus muscle thickness, and characteristic features in the g...
In a full-factorial experiment, the effect of height, porosity and pore size at three levels on the structural stiffness of 3D-printed, polylactic acid (PLA) scaffolds was investigated. The porosity and structural properties of the scaffolds were measured. The principal finding was that all three fa...
Exercise when young has been shown to induce an adaptive response that may be beneficial for lifelong bone health. Using gait experiments coupled with finite element models, we sought to understand how bone accommodates the mechanical demands associated with increasing mass. We found that both murin...
The foot’s role in walking on sloped surfaces is currently unclear. Here, we used a multi-segment foot model to explore how the foot adapts its mechanical work production to incline and decline walking.
Mechanical loading has been shown to positively influence tendon healing; however, the mechanisms remain unclear. This study aimed to evaluate the ability of biophysical stimuli - principal and deviatoric strain - in regulating healing using finite element (FE) method. Axisymmetric FE models were cr...
Although subjects with recurrent low back pain (LBP) demonstrate altered trunk control, the kinematic and kinetic responses of the trunk have not been carefully investigated. This study was conducted to compare the standing time, spine range of motion, and dynamic postural steadiness index based on ...
Pubic symphysis width is measured using 3D freehand ultrasound in different birthing positions: supine, lithotomy position, standing and squatting. The relative position of the pubic bones would also be analysed. Preliminary results show that the motion at pubic symphysis in different positions incl...
Most running studies are conducted in laboratories and lack ecologic validity. Purpose 1. compare landing impacts between footstrike patterns (FSPs) during a marathon and 2. assess the relationship between speed and landing impacts across FSPs. Methods: Tibial shock of 226 M+F individuals (44.3±1...
The purpose of this study was to investigate the effect of a 12-week transition program with simulated barefoot running (SBR) on AT adaptation.Seventeen recreational male athletes without minimalist shoe running experience were randomly assigned to SBR group and MIN group. Each participant was distr...
The intrinsic link between slower and faster muscle contractile elements in the musculoskeletal system can be generalised across scales from motor units within a muscle to synergistic muscles. At both scales, a unified plan should govern recruitment during movement across a range of mechanical deman...
This study evaluated the mechanical determinants of 40-m sprint performance and identified variables of a countermovement jump (CMJ) that relate to 40-m sprint performance in Australian Rules Football (ARF) athletes. Sprint mechanics were calculated using inverse dynamic methods from sprint times, w...
Annulus fibrosus (AF) cells of intervertebral discs (IVD) were cultured for 72h inside a 3D type I collagen matrix. When collagen matrix constructs were embedded with live AF cells, substantial matrix contraction (up to a 60% reduction in size) was observed. This contraction was not observed in cons...
A control optimization model predicts that an oscillating force perturbation can substantially influence the energetic cost of walking. Cost is decreased when peak ground reaction forces are aligned with positive perturbation forces (in-phase) but increased with the opposite alignment (anti-phase). ...
The aponeurosis of human muscles represents a significant proportion of the elastic tissues in series with the muscle. However, the aponeurosis should not be considered a simple spring, as is often assumpted in biomechanical models (e.g. Hill-type muscle models). Recent evidence for the effects of f...
Mechanomyography (MMG), a low frequency sound signal, can be used to record muscle internal mechanical movements. In this study, we use MMG to measure muscle vibrations of human medial gastrocnemius (MG) during isometric plantarflexion at different contraction forces and at different ankle joint pos...
Understanding the magnitude and location of the head forces experienced by front row players during scrummaging is key to study cervical spine injury mechanisms. A novel experimental protocol was devised to measure head forces and estimate the location of the point of application of the force across...
Free Achilles tendon external twist can be quantified using high resolution MRI and freehand 3D ultrasound methods. Internal fascicle twist may be measured by using feature tracking methods.
Chiari type I malformations (Chiari I) are congenital deformities characterized by migration of the cerebellar tonsils through the foramen magnum. The condition is associated with headaches, chronic fatigue syndrome, orthostatic intolerance, and other neurologic syndromes. Despite patients’ descri...
The implant-to-bone interface of endoprostheses is a critical region affecting the stability of the implant. Current advancements in additive manufacturing allow to manufacture novel bone-replicating porous surfaces capable to enhance osteointegration. In this study, small cylindrical porous samples...
Varying recruitment patterns between slow and fast motor units can be correctly predicted using musculoskeletal simulations that minimize a cost function that is metabolically-informed. The use and function of different types of motor unit allows contractions to be metabolically economic and mechani...
The Intrepid Dynamic Exoskeletal Orthosis (IDEO) is a custom-made carbon fiber orthosis, typically prescribed to patients who experience pain or deficits in strength and range of motion in the foot or ankle joints. The use of the IDEO results in differences in work and power outputs, and work-ratios...
Our musculoskeletal system contains several muscle groups in which different muscles share a tendon. Most well-known are the quadriceps muscles, sharing the patellar tendon, and the triceps surae muscles, sharing the Achilles tendon (AT). The structure and mechanical properties of these tendons have...
The purpose of this investigation was to quantify the mechanical response of healthy facet capsular ligaments (FCL) in a porcine model. Twenty-five porcine FCL samples were subjected to uniaxial stress-relaxation tests at 30% and 50% strain to quantify their elastic and viscoelastic properties. Resu...
The intrinsic foot muscles (IFM) modulate metatarsophalangeal joint (MTPJ) mechanics. Carbon fiber plates in footwear can change MTPJ mechanics and running economy [1]. This study investigated whether an increase in toe-flexor muscle strength can elicit similar changes in joint mechanics and running...
Osteoarthritis (OA) development after anterior cruciate ligament reconstruction (ACLR) is a well-documented phenomenon. Loading alterations early after surgery have been linked to the development of OA. Early OA is characterized by the loss of glycosaminoglycans (GAG) within cartilage. This study ex...
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