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The development of wearable inertial sensors has provided the possibility to assess and diagnose Parkinson’s disease (PD) based on the patients’ gait pattern. The goal of this study was to compare the classification performances from fifteen different combinations of sensor configurations using ...
Designing wearable devices for use on deformable terrain is an ongoing engineering challenge. This is particularly apparent when we examine locomotion on dissipative surfaces such as sand or snow. These surfaces have complex, variable dynamics which lead to increased fatigue and metabolic cost durin...
The purpose of this study was to directly compare the passive moduli of single muscle fibers and fiber bundles from both frog and mouse muscles. This study demonstrated that the passive elastic tensile load born by frog fibers is almost exclusively born intracellularly by the muscle fibers themselve...
The most commonly injured area for golfers is the lower back. The purpose of this study was to describe the sequencing patterns of the pelvis, lower trunk (LT), and upper trunk (UT) in golfers with lower back pain (LBP). Twelve amateur golfers with a history of LBP performed five driver swings recor...
The current work encompassed the development of a multi-directional CT-compatible mechanical testing device and quantified the accuracy of full-field displacements predicted by QCT-FEMs of the scapula. Digital volume correlation (DVC) was used to derive full-field experimental displacement measureme...
Orthotic insoles can be an effective way to alter gait mechanics to conservatively manage knee osteoarthritis (OA). Changes in plantar pressure distribution and comfort impact adherence to insole treatment but have not been investigated in insoles specific for knee OA. We evaluated differences in pl...
We present a statistical shape model (SSM) for predicting cartilage morphology from bone, which may enable the rapid generation of cartilage morphology from sparse imaging data. A SSM was trained on 25 segmented MRIs of the knee. The bones of the SSM were fitted to raw segmented data from one test s...
In this study, a ten degree-of-freedom, two-legged cyclist and bicycle model was developed and utilized for predictive dynamic simulations of standing starts. Direct collocation optimal control was used to generate the predictive simulation with the goal of maximizing distance travelled over a fixed...
In the last two decades, quantitative magnetic resonance imaging (qMRI) has grown into a powerful tool for exploring in-vivo biomechanical and functional properties of the musculoskeletal system. However, most qMRI methods are developed and maintained in-house, which results in a lack of transparent...
This project tested a novel method to assess performance in a countermovement jump test (CMJ) using a smartphone held to the hip. The intended use is to assess a person’s force producing capabilities to track general progress in a health intervention. The results showed repeatable correspondence t...
The purpose of this study is to maximize the performance of long jump in lower extremity amputees using computer simulation. A two-dimensional human body-prosthesis model was constructed, and the jump motion including approach run and prosthesis foot were optimized using genetic algorithm to maximiz...
Model-based biplanar fluoroscopic bone tracking is a powerful tool for biomechanists seeking to quantify in vivo, functional joint motion. The sizes, shapes, and configurations of the osseous foot and ankle anatomy present a series of unique challenges to obtaining optimal kinematic data with minima...
Plantar fascia is related to the metatarsophalangeal joint (MTPJ) by the windlass mechanism, but the correlation between joint stiffness and diagnosis of plantar fasciitis has not been researched. In this study, passive MTPJ dorsiflexion stiffness was measured in healthy subjects and patients with p...
Swing tempo and rhythm are the most important golf performance indicators. In this study, we investigated the swing tempo and rhythm according to different golf clubs and distance using a wireless inertial measurement unit (IMU) sensor. 14 golfers performed repeated, consistent swing with three golf...
An accurate and reliable procedure to co-register CT and MR images of the cervical spine (C1-C7) is essential to construct a personalized model of the neck musculoskeletal system. In this study, we proposed principal component analysis (PCA) based a simple and fully automated registration technique ...
In this study, we determined the relationship between muscle architecture and peak torque and total work produced by the plantarflexors during maximal effort isokinetic contractions. We measured resting fascicle length and pennation angle and calculated muscle thickness in the medial gastrocnemius u...
The assessment of kinetics during stair gait can only be achieved using costly force plates, which makes it difficult to implement in most clinical settings. In this study, we aimed to validate a depth sensor-driven musculoskeletal model using the AnyBody modeling system to predict three-dimensional...
Flat feet resulting from a collapsed arch are a common concern for children with cerebral palsy (CP). Surgeries aim to restore the arch and improve pain, ambulatory efficiency, and brace tolerance. To evaluate these surgical outcomes, plantar pressures (PP) from patients indicated for a lateral colu...
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...
Injuries in aquatic sports are often associated with prolonged fatigue due to repetitive motions. These injuries are often more common in females due to an increased endurance. We calculated rate of change in muscle activation in expert aquatic athletes and controls throughout a fatiguing task. Slop...
Use of passive exoskeletons to tune muscle-tendon dynamics for improvement of balance remains an unexplored area of research. A computational model of standing balance on a passive prosthesis was used to find values of hip exoskeleton stiffness and damping which optimized resistance to destabilizing...
An exoskeleton to assist the knee during a vertical jump was built and tested. The device stores energy in springs during knee bending before the jump and releases energy during the leg push. The device thus provides support during both the negative and the positive work phases of the muscles during...
The purpose of this study was to further develop robust ways to non-invasively measure and report scapular dynamics used by diverse reverse total shoulder arthroplasty (RTSA) patients.
A rotating platform (RP) total knee replacement (TKR) design increased total contact area and reduced peak contact pressures compared to a fixed-bearing (FB) design in a finite element analysis (FEA) of turning gait. Considering physiological knee biomechanics through FEA may provide important desig...
Use of an adaptive treadmill enables natural variation in walking speed and may be beneficial for rehabilitation applications. This study investigates the differences in plantar flexor muscle force during walking with an adaptive treadmill versus a fixed speed treadmill. While walking at self-select...
Muscle weakness due to disuse could impair the ability of older adults to prevent a backward fall. A musculoskeletal model is thus being used to predict the effect of strength training of selected muscle groups on older adults’ ability to restore static balance after a recovery step from a backwar...
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...
Principal component analysis (PCA) was used to compare differences in maximum reach on three different groups and 3 different loading conditions. The methodology clearly demonstrated the ability to detect differences in angle due to groups and weight moved. The aim is to develop new clinically relev...
Herein, a novel, scaffold-free fiber engineering platform was utilized to investigate the influence of quasi-static and dynamic uniaxial loading on tendon fiber development. Engineered fibers were subjected to 3 days of basic loading (i.e., intermittent cyclic uniaxial strain) or combined loading (i...
Real-time prediction of Achilles tendon strain can be used to inform rehabilitation and training interventions. In this study, we combined an electromyogram (EMG)-informed neuromusculoskeletal (NMS) model of the lower limbs with a surrogate finite element (FE) model of the Achilles tendon to estimat...
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