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Three-dimensional (3D) finite element (FE) models using subject-specific kinematics during a single-leg landing task were created for a person with patellar tendinopathy (PT) and a healthy control. Maximum principal stress (MPS) in the patellar tendon was the primary dependent variable of interest. ...
In this study, three ankle joint models with increasing level of personalisation are compared within a standard musculoskeletal model (MSKM) of the lower limb, integrated with individual ligaments and articular surfaces from magnetic resonance images (MRI) to assess their anatomical consistency. Kin...
A computer simulation for pedaling movements was conducted. The computer model had the muscles on the lower extremities including the bi-articular muscles, and a neural oscillator controlled the activity of the muscles resulted in joint movements periodically. As a result, the bi-articular muscles c...
The purpose of this study is to examine the difference in the kinematic profiles during walking between indoor and outdoor environments. Ten healthy young males were participated in this study. The subjects walked about 90m in each environment at a self-selected preferred walking speed. The joint ki...
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...
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.
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...
Recent reports have suggested that high loading rates, typically associated with a rearfoot strike (RFS) pattern, during running may be related to overuse injuries. With the recent increase in wearable sensors it is important to identify paradigms where footstrike pattern (FSP) can be detected from ...
The potential influence of hip muscle activity on the control of postural sway is often overlooked. To explore this, we used the NIH toolbox test of standing balance as well as tests of force steadiness and maximal voluntary contraction torque for the ankle flexors and extensors and the hip abductor...
New interventions for spinal pathologies can be tested on computational models of the spine without putting the patient at risk. However, existing models are usually built from different datasets which may be inconsistent with each other. In this study, a full body musculoskeletal model was develope...
Knee osteoarthritis (KOA) is a major cause of pain and disability in the elderly population with many daily living activities being difficult to perform. In the present study, we describe and evaluate an inertial motion capture (IMC) driven musculoskeletal model to estimate the knee adduction moment...
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...
Achilles tendon shear wave speed was measured in 16 young and 16 older adults walking at speeds ranging from 0.75 to 1.5 m/s. Subject-specific calibrations were performed and used to estimate tendon stress from wave speed. We observed a consistent and substantial decline in tendon wave speed and str...
Even in constrained activities, like pedaling, the indeterminant musculoskeletal system allows for different muscle activation patterns to achieve the same task, which may lead to subtly different kinematics. We found that pedaling coordination patterns differed significantly with respect to experie...
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...
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...
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...
Several biomechanical variables have been linked to running economy, in addition to extrinsic factors such as footwear. Experienced runners performed treadmill running on separate days and in different footwear: minimal, neutral cushion, and highly cushioned. Running kinematics and running economy (...
Ultimate frisbee players have a high rate of lower limb injury¶ such as ACL tears. We studied the prevalence of high-risk¶ cutting maneuvers in women’s collegiate ultimate players¶ during competition using lower-body wearable motion¶ sensors. Cutting frequency ranged from to 19 cuts per point....
Inverse dynamic (ID) analyses of baseball pitchers have assumed body segment inertial properties scaled from total body weight and segment lengths. In our recent study [1], use of dual energy X-ray absorptiometry (DXA) segment masses produced higher shoulder kinetics than use of scaled masses. The a...
The purpose of this study was to distinguish subjects with different shoulder disorders, using musculoskeletal simulation with movements of clinical physical examinations.
Forces in the gastrocnemii, quadriceps, and hamstrings and tibiofemoral axial contact forces estimated by a deterministic model are compared to instrumented prosthesis measurements and EMGs and demonstrate reliable results.
We used statistical parametric mapping to test differences in spine and lower limb 3D kinematics in people with and without low back pain during functional tasks. Our results indicate differences in movement of the lower thoracic segment, upper and lower lumbar segment and knee joint throughout walk...
The objective of this study is to restore a gastrocnemius-like ankle-knee coupling to individuals with lower limb amputation (ILLA), then 1) characterize how different gastrocnemius dynamics (e.g., stiffnesses) affect whole-body gait biomechanics and 2) explore which gastrocnemius behaviors are most...
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...
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 aim of this study was to identify homogeneous subgroups of running gait patterns in asymptomatic subjects using 3-D kinematic data from the foot-ankle complex. Seventy-three healthy long-distance recreational runners were assessed for 3-D running kinematics. A Hierarchical Cluster Analysis was a...
Due to the anatomical structure of Achilles tendon, it has been hypothesized that muscle force imbalance within the triceps surae (TS) muscle group may play a role in the development of Achilles tendinopathy. The aim of this study was to determine if the sharing of force production within the TS dif...
ACL reconstructions aim to restore knee joint stability and decrease knee joint laxity. However, laxity in the frontal plane is not often studied during gait. Twenty-four young adults, twelve who had an ACL reconstruction, and twelve controls, were recruited to perform a maximum of ten gait trials e...
Our understanding of the relationship between 3D bone shape and knee osteoarthritis (OA), as well as our ability to investigate potential causative factors of OA, has been hampered by the time intensive nature of manually segmenting bone from MR images. Thus, we aim to develop and validate a fully a...
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