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The purpose of this investigation was to explore changes in passive lumbar spine properties in response to simulated low velocity rear impacts and assess this relation with low back pain (LBP) symptom reporting post impact. Participants were exposed to two collision simulations: in an automobile sea...
To correct for soft tissue artefacts in skin mounted accelerometers a transmissibility function can be applied to the data. This function is quantified by analysis of the acceleration-time data from the response to a nudge test; however this data can often be noisy. An application of Fourier analysi...
The quantitative assessments of balance ability with fall risk by functional mobility testing are important. The representative test is Timed up and go (TUG) test. A previous study showed that assessing the TUG test by total duration has limitations in screening faller. Therefore, the TUG test is pe...
Fatigue of skeletal muscles reduces their ability to prevent injuries to their corresponding tendons. For example, Achilles tendinopathy often results when the tendon is overloaded due to fatigue of the triceps surae. To better understand this occurrence, we used a high-density array of electrodes t...
This study tested a novel upper limb weight support device with a participant living with stroke. Outcome measures were feasibility of the device with the user and movement with and without the device.
Knee joint kinematics and strain for the Anterior Medial (AMB) and Posterior Lateral (PLB) bundle of the Anterior Cruciate Ligament (ACL) were calculated using a modified OpenSim model for a group of Division 1 Collegiate female athletes during a land and cut task. Group comparisons were made betwee...
A fibril-reinforced poroviscoelastic material model was introduced to model anterior cruciate ligament stress-relaxation behaviour in tension. The proposed model with an exponential fibril formulation was able to capture the stress-relaxation response at physiological strain levels. It provides insi...
CT-based finite element (FE) modelling can be used to assess bone fragility around the knee after spinal cord injury (SCI), but models must be validated using realistic loading scenarios. Activities such as wheelchair transfer are likely associated with biaxial loads (e.g., compression + torsion), h...
Creep, a gradual length change under constant load, may influence how someone senses pain. This study sought to determine if there were local or distal changes to mechanical pain sensitivity following a creep-inducing trunk flexion exposure. Findings showed inconsistent sensitivity changes immediate...
3D printing is increasingly used to design patient-specific medical products [1], such as orthoses. Indeed, 3D printed foot orthoses (FO) have an interesting potential as they can include optimized patterns to locally adjust the mechanical properties according to each patient’s gait pattern. Model...
Patellofemoral pain (PFP) reduces quality of life for thousands of adolescents each year. Having previously demonstrated that patellar maltracking is associated with PFP in adolescents, our study aimed to determine if PF shape is altered in adolescents with PFP and if shape influences patellar maltr...
Wearable devices have enormous potential to enhance human performance and health if the devices are evidence-based and developed to meet a true need. An essential ingredient in developing these novel concepts has been biomechanists working in close collaboration with colleagues in materials science ...
Predictive simulations hold the potential to greatly expedite advances in understanding healthy and pathological movement. We developed a computationally efficient framework to predict human movement based on optimization of a performance criterion. The framework generates three-dimensional muscle-d...
A fatigue testing protocol that closely mimics in vivo loading conditions of equine third metacarpal (MCIII) subchondral bone was developed to help understand the development of subchondral bone injury.
We present Feasibility Theory, a conceptual and computational framework to unify today’s theories of neuromuscular control. We begin by describing how the musculoskeletal anatomy of the limb, the need to control individual tendons, and the physics of a motor task uniquely specify the family of all...
Biomechanical changes in gait as a result of pregnancy have been studied in walking but not running. Thus, the objective of this pilot study was to examine changes in running mechanics, particularly at the pelvis and trunk, between pre- and post-pregnancy as well as changes in running habits. At 6-w...
Chemotherapy treatment of cancers by paclitaxel often results in peripheral neuropathy which is the main reason for patients to withdraw from the therapy. The function of a peripheral nerve depends highly on biomechanical properties of its tissues and cells. The goal of this study is to investigate ...
In this study we created an integrated system combining motion capture, plantar pressure, and shear stress. This device was used to investigate the effects of walking speed on metatarsophalangeal (MTP) joint power and work. MTP negative work increased substantially with walking speed, illustrating t...
Foot orthoses (FOs) are commonly used to alleviate several pathologies. Their design will affect differently lower limb kinematics. Additive manufacturing, 3D printing, makes it easier to provide innovative geometries of customized FOs in accordance to patient-specific needs. This study aimed at est...
Controllability of posture in the medial-lateral direction is determined as a critical capacity for balance maintenance in step initiation. Eleven young healthy participants stood on the force platform and instructed to take a step while experiencing a pendulum perturbation from the lateral side of ...
This is a biomechanical study evaluating the micromotion of a baseplate in a reverse shoulder arthroplasty during simulated abduction. We tested the following factors: bone density, screw length, number of screws, screw angle, and central peg length. Our findings corroborate the importance of higher...
Walking at high speeds for longer periods feels uncomfortable and is fatiguing. This study compares ankle flexor and extensor strength prior to and following 35 or 47 min fast walking. Following the walking period, isometric maximal ankle dorsiflexor and plantarflexor strength was reduced with 25% a...
Butterfly pull-up is a popular Crossfit exercise that requires unique biomechanical strategies to maximize performance. However, little is known regarding changes in butterfly pull-up biomechanics when performed until failure. In this study, the elbow, shank and thigh kinematics during butterfly pul...
There are many factors that can influence concussion recovery, including the sex of the patient, thus necessitating sex-specific analyses. Few studies have investigated concussion recovery between sexes using objective outcomes as a measure of recovery. We examined the association between sex and re...
The purpose of this study was to investigate alterations in lower limb work with military-relevant loads in females and males. This analysis indicates that females use a different joint adaptation strategy that relies on increased power generation at the hip, which may increase the risk of musculosk...
The use of bracing is a cost-effective and non-invasive treatment that provides pain relief without side effects with respect to knee osteoarthritis. In this study, a model with knee osteoarthritis combined with a finite element analysis model and a musculoskeletal model was constructed. This study ...
Foot ligaments are non-linear viscoelastic structures that become stiffer as loading rate increases. This study aims to characterize the rate dependent stiffness of foot ligaments at various loading rates. After excising and potting bone-ligament-bone specimens, ligaments were displaced to 10% strai...
This study aimed to compare dynamic foot pressure distributions at different phases of walking in three different foot postures: a normal one (pes planus) and two abnormal ones (pes rectus and pes cavus). Fifteen young subjects participated in this study. At the start of mid-stance, the peak pressur...
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