Showing papers in "Journal of Biomechanics in 2013"

TL;DR: The method, called 'statistical parametric mapping' (SPM), uses random field theory to objectively identify field regions which co-vary significantly with the experimental design, thereby making it useful for objectively guiding analyses of complex biomechanical systems.

TL;DR: This study provides the necessary first step for additional studies that can evaluate the distribution of stiffness throughout muscle, and combines traditional materials testing techniques with SWE measurements to show increased stiffness measures with increasing tensile load.

TL;DR: Three-dimensional muscle-driven simulations of running at different speeds revealed that soleus provides the greatest upward mass center acceleration at all running speeds; soleus generates a peak upward acceleration of 19.8m/s(2) (i.e., the equivalent of approximately 2.0 bodyweights of ground reaction force) at 5.0m/S.

TL;DR: This study investigated the influence of subject-specific geometry and knee joint kinematics on the prediction of tibiofemoral contact forces using a calibrated EMG-driven neuromusculoskeletal model of the knee to improve the accuracy of medial contact forces and lateral contact forces by 47% and 7%, respectively.

TL;DR: This widely available, low-cost and portable system could provide clinicians with significant advantages for assessing some spatiotemporal gait parameters, however, caution must be taken when choosing outcome variables as some commonly reported variables cannot be accurately measured.

TL;DR: It is concluded that the plausibility of the assumption of idealized velocity profiles as inlet BCs in personalized computational models can lead to misleading representations of the aortic hemodynamics both in terms of disturbed shear and bulk flow structures.

TL;DR: Toe-in gait may be a promising non-surgical treatment for patients with medial compartment knee osteoarthritis by reducing the first peak of the knee adduction moment and increasing the peak external knee flexion moment.

TL;DR: The present findings demonstrate that WBB is sufficiently accurate in quantifying CoP trajectory, and overall amplitude and velocity during single-leg stance balance tasks.

TL;DR: The accuracy of the Head Impact Telemetry System for individual head impacts is evaluated, which shows that a large helmet on the Hybrid III produced average pressures greater than the 99th percentile volunteer pressure level.

TL;DR: A comprehensive study on the biomechanical response of human brain tissue is necessary to investigate traumatic brain injury mechanisms and Corona radiata was found to be stiffer than cortex, thalamus, and corpus callosum in tension and compression.

TL;DR: It is demonstrated that SSWE, when carefully applied, can be a highly reliable technique for muscle elasticity measurements and may be used as an indirect measure of passive muscle force.

TL;DR: This work analysed pulsatile flow fields obtained in idealised and anatomically-realistic arterial geometries using computational fluid dynamics techniques, and investigated the multidirectionality of the flow fields, capturing this aspect of near-wall blood flow with a new metric – the transverse wall shear stress (transWSS).

TL;DR: This review will focus on four topics related to improved assessment of bone interstitial fluid flow, including the advantages and limitations of imaging technologies to visualize bone porosities and architecture at several length scales.

TL;DR: The purpose of this review was to summarize the current state of finite element modeling validation practices from the literature in biomechanics and orthopedics and to present specific methods and criteria limits that can be used as guidelines to assess mesh quality, validate simulation results and address energy balance issues.

TL;DR: Blood pressure and wall shear stress were found key hemodynamic predictors of aneurysm dilatation, and their dissimilarities are likely associated to the morphological anatomy of the aortic valve.

TL;DR: It is shown that the significant progress achieved in both fronts paves the way toward clinically relevant computational models that can simulate the performance of a range of heart valves, native and prosthetic, in a patient-specific left heart environment.

TL;DR: Lower knee moments of the ACLR knee suggest that increased joint loading may not be the initiating factor in the development of OA following ACL reconstruction; but rather previous described kinematic or biological changes might initiate the pathway to knee OA.

TL;DR: Data generated with the proposed methodology for predicting ground reaction forces (GRFs) during level walking without the help of a force plate may be used instead of raw GRF data in gait analysis and in calculating joint dynamic data using inverse dynamics.

TL;DR: There was no evidence to support a difference between habitual and converted running for joint contact forces, but the increased loading at the ankle joint for FFS is an area of concern for individuals considering altering their foot strike pattern.

TL;DR: It is shown that the joint angle at which the tendon falls slack can be experimentally determined using supersonic shear imaging and is crucial to a better understanding of muscle-tendon interactions.

TL;DR: The antagonistic and agonistic roles of Gastrocs and Soleus respectively in ACL loading are demonstrated and the role of the ankle plantarflexors should be considered when developing training strategies for ACL injury prevention.

TL;DR: It is suggested that the HR method may be better defined, not as a measure of rhythmicity or stability, but as a measures of step-to-step symmetry within a stride.

TL;DR: The functional role of GAGs in tensile tendon mechanics is clarified by directly investigating the mechanical response of individual collagen fibrils within their collagen network in both native and GAG depleted tendons, and it is concluded that the hydrophilic G AGs seem to act as mechanical crosslinks but rather act to promote collagenfibril sliding under tension.

TL;DR: Greater side-to-side asymmetry in vGRF and higher CoM during impact indicate the second landing of a DVJ may exhibit greater perturbation and better represent in-game mechanics associated with ACL injury risk.

TL;DR: The findings of this study show that human knee cartilage undergoes diurnal changes in strain that vary with site in the joint, and provides a baseline for future studies investigating the effects of altered biomechanics on diurnal cartilage strains and cartilage physiology.

TL;DR: It was hypothesized that a gradually reducing radius may attenuate sudden changes in anterior-posterior motion that occur in mid-flexion with traditional discrete-radius designs, and served as a useful pre-clinical design-phase tool to improve implant kinematics.

TL;DR: The PC-based motion analysis offered a highly sensitive approach to identify characteristic whole body patterns of movement associated with pathological gait and may provide an improved basis for the development of interventions to modify knee load.

TL;DR: Information is provided on the kinematic discrepancies between OMC and biplanar videoradiography that can be used to optimize methods employing both technologies for studying dynamic in vivo knee kinematics and kinetics during a jump-cut maneuver.

TL;DR: Load at different intensity levels and contraction types increased patellar tendon modulus whereas muscle strength seems to respond more to load-intensity.

TL;DR: It is concluded that, despite differences in anthropometry, men and women adopt similar gait adaptations when carrying load, adjusted as a percentage of body weight.