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The aim of this study is to compare an IMU-based system with a motion capture system in relation to nonlinear analysis of kinematics. Subjects were asked to walk on an instrumented treadmill at their self-selected walking speed and the Lyapunov exponent, a measure of stride-to-stride variability, wa...
This study addressed the biomechanical effect of varying forefoot stiffness in a foot prosthesis during different ambulation tasks. The external mean ankle moment arm (EMAMA) outcome measure captures the mean dynamic effects of changes in center of pressure (CoP) that impact body dynamics. Findings ...
Personalized surgical treatment of the foot such as customize artificial bones and customized joint replacements, rely on the morphology of the bones of the contralateral side. This approach is based on the implicit assumption that there is high level of symmetry in the tarsal bones of an individual...
154 people with chronic low back pain (CLBP) were recruited for a baseline data collection, as a part of a randomized, controlled clinical trial. All participants completed the Numeric Pain Rating Scale (NRS), modified Oswestry Disability Questionnaire (MODQ), clinical tests of maximum flexed and ex...
Traumatic knee injuries often involve cartilage lesions and may lead to post-traumatic osteoarthritis (PTOA). One of the signs of PTOA is the loss of fixed charge density (FCD) of proteoglycans in cartilage. Mechanisms to understand local adaptive processes remain unclear. A numerical model was deve...
Joint overloading has been historically implicated in the comorbid association between osteoarthritis (OA) and obesity. However, findings in obese mice and humans strongly suggest that load-independent systemic and joint inflammation are lynchpin drivers of joint degeneration. New evidence suggests ...
A brace limiting knee flexion was used to isolate the contributions of stiff-knee gait on contralateral limb loading during walking. Our results suggest that a fixed knee condition during stiff-knee gait does not increase contralateral lower limb joint loading, supported by observations of reduced p...
The concurrent validity and reliability of two mobile applications designed to measure vertical jump heights were analyzed in this study using a force platform and 3D motion analysis as criterion methods. The results showed that jump height can be accurately and reliably estimated using these mobile...
Osteoarthritis (OA) is characterized by the painful degeneration of diarthrodial joints and is the leading contributor to disability worldwide. OA disproportionately affects individuals with obesity. Traditionally, the relationship between OA and obesity has been explained by increased loading due t...
Resisted sprint training is a traditional way to train the elite athletes. According to the leading joint hypothesis, adding mass on the shanks is seen as a more targeted way to strengthen the special muscles. The aim of this study is to examine the influence of this training method on the kinematic...
Obesity is a risk factor for the development of knee osteoarthritis. While numerous studies have hypothesized that the primary pathological stimulus is increased joint loading resulting from elevated body mass, there are limited data on the effects of obesity on local in vivo strain distributions in...
The present study examines the validity and reliability of a depth-camera based approach for segment lengths estimation of the pelvis and the lower extremity. For the evaluation, a Kinect sensor and an optical motion capture system were used to automatically deduce the segment lengths of young subje...
High impact forces are a risk factor for injuries in jump-landing tasks. Strategies to reduce impact during training may help to protect against these risks. Here we describe the impact forces experienced during landing tasks using a model of rebound shoe commercially available. We found that the sh...
Exoskeletons reduce whole-body net metabolic rate by modifying limb-joint biomechanics. Yet, muscles, not limb-joints, are the primary consumers of metabolic energy during locomotion. Perplexingly, it is unestablished how exoskeletons alter muscle dynamics to improve locomotion economy. We investiga...
A descriptive kinematic analysis was performed to compare stance width, foot orientation, and sagittal angle of the ankle, knee, hip and trunk between self-selected and a spine motion- constrained lifting technique. When lumbar spine motion was constrained, hip flexion, knee flexion and ankle dorsif...
Muscular power is reduced with fatigue [1,3]. During cyclic contractions muscular power is highly dependent upon force-velocity characteristics (F0, Vmax, curvature) and activation-deactivation dynamics [2], which change with fatigue [1,3]. Determining the contribution of changes to each characteris...
Temporomandibular joint osteoarthritis (TMJ-OA) has considerable prevalence with 13-58.3% of the population. The signs and symptoms of TMJ-OA include joint pain, clicking and crepitus, limited mouth opening, mandibular movement dysfunction, as well as facial esthetic changes, which cause the limited...
In this investigation of 20 knees, part of a prospective study of surgical technique and outcomes of total knee arthroplasty, we observed no significant correlation between anterior femoral translation during passive knee flexion, measured intraoperatively, and peak involved knee flexion moment duri...
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