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Wearable instruments for gait analysis offer new opportunities to study human motion during activities of daily living (ADL). Previous work has overlooked the importance of characterizing non-steady state ADL such as sit-to-stand, gait initiation/termination and turning using wearables. The purpose ...
The Facial and Ocular CountermeasUre Safety (FOCUS) headform was designed to evaluate injury risk and effectiveness of countermeasures. Many of its segmented facial regions have been evaluated previously and shown to have biofidelic responses. The current study investigated both the biomechanical re...
The purpose of this study was to investigate the individual fingertip forces between healthy and spinal cord injury (SCI) patients. Thirty volunteers participated in this study. Analysis showed that every p-value is a statistically significant difference for the independent t-test. In the comparison...
Suture anchors are designed for use with arthroscopic techniques. In this study, finite element analysis was used to compare the stress distribution in 24 different designs of suture anchors. The results of von-Mises stress show that the optimal design reduces 14.7% von-Mises stress of a former desi...
Optimization techniques solve the muscle redundancy problem assuming some performance criterion, such as muscle activation, force, stress, metabolic energy or joint contact forces determines muscle coordination. However, it is not yet clear which criterion describes muscle coordination and contact f...
This study used principal component analysis to identify key movements that contribute to ground reaction forces in sports. The relative importance of fundamental movement features for the ground reaction force profile was task-dependent, making generalised load quantification across different sport...
Primary cilia length was measured ex vivo in 3D after wild type and itg?1-null chondrocytes were exposed to iso- or hypo-osmotic stress. We show that integrin ?1?1 is necessary for primary cilia lengthening following hypo-osmotic stress.
Fretting corrosion has emerged as one important reason for failure of modular hip prostheses during the last decade. This increase might be associated with the reduction of the taper diameter to improve the range of motion of the hip joint, which occurred about 20 years ago. The magnitude of the mic...
Sports related concussions are managed clinically; however, recent evidence suggests persistent deficits beyond clinical recovery. Nineteen intercollegiate student-athletes performed 5 trails of gait initiation (GI) prior to the concussion (baseline) and again on the day they returned to participati...
Joint mobility plays a part in the performance of competitive sports. It can be used as a training or as a warm-up exercise alone. Good joint mobility can produce better power transmission and exert better competitive level. On the contrary, it may change movement pattern that produce more force on ...
Trochlear dysplasia (TD) and medial patellofemoral ligament (MPFL) rupture are major factors in patellofemoral instability. We studied the effect of TD and MPFL rupture on PF contact pressure and kinematics in a cadaver-specific musculoskeletal knee model during a simulated non-weight-bearing knee e...
We used a simple musculoskeletal model to determine the ability of an elastic ankle exoskeleton to restore older adult locomotion performance to that of young adults. We found that exoskeleton stiffness (kexo) values greater than 10% of young adult Achilles tendon stiffness (kten*) can reduce the me...
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...
Maturation has been reported as a predictor of injury in physically active adolescents. Asymmetry is commonly associated with pathology and has been reported in adolescent runners. Uninjured adolescent distance runners were stratified by maturity and side-to-side limb symmetry was measured during se...
This study analyzed the electromyography (EMG) activity of masseter and anterior temporalis muscles during chewing in 2 different posture conditions: natural head posture (NHP) and deliberate forward head posture (FHP) in healthy individuals; and to compare EMG activity between subjects based on the...
The objective of our study was to study the impact of a gripping aid on the kinematics and the functional motor capacities of the hand, in healthy subjects. Our hypothesis was that this spherical device could stabilize the first commissure of the hand and induce kinematic changes. A sample of 19 hea...
The present work characterized the variability of postural reactions induced by mechanical vibration of ankle tendons. Posturography measures were obtained with a forceplate on thirty healthy adults. Overall, results denoted a high level of measurement error (intra-subject variability), but good to ...
Marker error affects musculoskeletal (MSK) modeling outputs. For effective marker set optimization it is essential to examine the errors of all markers. Data of 11 subjects were collected during a single-leg forward jump-landing (FJ). OpenSim Inverse Kinematics (IK) was performed and maximum (max) e...
We hypothesize that the articular surfaces of the carpals are shaped to optimally distribute contact loads. To test this hypothesis, we developed a congruence-based forward model and validated it with in vivo data. A single wrist was analyzed by taking a high-resolution MRI and three CT scans during...
Flatfoot is a complex multi-plane deformity of the foot, but is often classified using planar foot prints. A novel foot sole scan system (FAST) enables fast measurement of the three-dimensional foot sole surface and thus relevant morphological parameters. The current study aimed to assess the intra-...
Despite there are many types of internal fixation devices for surgical treatment of acetabular fractures, reliable and accurate test method for assessing post-op biomechanical stability is still lacking. This makes more difficult for surgeons to accurately predict post-op stability of the device to ...
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...
The study examined the electromyographic activation of major muscle groups during lumbar stabilization exercises using ‘LevelBelt’ alignment. Significant difference are seen during static and dynamic exercises with accurate lumbo-pelvis alignment highlighting the importance of proper objective m...
Turning, especially in postural dual task conditions, is a challenging daily routine for older adults. The purpose of this study is to investigate the postural control of healthy older adults under postural dual task conditions during turning. A total of 13 healthy older adult were recruited form th...
For analysing the biomechanics of gait steady state velocity should be reached. With ramp construction the walkway is limited and it is not clear if the same rules for reaching speed steady state as for level walking apply over a range of downhill inclines. Therefore, temporo-spatial, kinematic and ...
Hip fracture is a common health risk among elderly people worldwide. Sideways or lateral fall has been identified as the most critical situation for the elderly to develop a hip fracture, since the hip is normally covered with a thin layer of soft-tissue that is inadequate to attenuate the impact fo...
The removal of gender restriction in combat-centric roles will increase female soldier exposure to regular heavy load carriage. Physiological sex differences place women at a disadvantage for these physically demanding roles. Identifying sex-specific responses during a standardised load carriage tas...
The versatile soft tissue contrast of magnetic resonance imaging (MRI) has enabled studying local strains in muscle fiber direction (Ef) as probed by diffusion tensor imaging (DTI). Recently, tracked fascicles of medial gastrocnemius (GM) muscle showed heterogeneous Ef distributions. As opposed to a...
The windlass mechanism of the human foot is a well known anatomical feature that causes the height of the medial longitudinal arch (MLA) to rise in response to toe dorsiflexion under constant load.¶ It is interpreted as a stiffening mechanism which is hypothesized to work by increasing the moment a...
Neck pain (NP) is one of the most common and disabling musculoskeletal conditions in the world and is more prevalent in females. As a part of clinical examination for individuals with NP, ultrasound (US)-based imaging biomarkers of the cervical muscles have been increasingly utilized: cross sectiona...
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