Abstract Archive

Toe deformities and dysfunction of the tibialis posterior muscle is common among patients with rheumatoid arthritis. The aim of this study was to investigate potential muscle compensation patterns when the tibialis posterior muscle starts to be less active. Results of the study show that flexor digi...

Muscular hydrostats such as the tongue are modeled using the finite-element (FE) method, which is computationally expensive. To reduce the computational cost, approximate techniques based on dimensionality reduction (DR) and deep neural networks (DNN) have been proposed. On the one hand, linear DR t...

The transient response of postural control was investigated during quiet, eyes closed stance in young and elderly populations, as a first step in assessing the clinical relevance of this transient behavior. Time-dependent estimates of commonly used center of pressure parameters were analyzed through...

We examined the effects of carrying various loads with one hand (up to approximately 10 kg) for a distance of approximately 6 m on trunk kinematics and kinetics among older and obese males. Three-dimensional (3D) trunk angles and moments about the L4/L5 vertebrae were calculated. Results suggest tha...

The paper presents an example of a successful use of 3D motion analysis for forensic purposes, and tries to show the cases in which this analysis is helpful and offers opportunities to law enforcement agents. In the present case of a shotgun hunter a fundamental question was asked - was there someon...

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...

With many TARs on the market the variety of implant fixations mechanisms is large. The amount of micromotion within the Bone-Implant-Interface affects clinical success. Current fixations mechanisms are compared to new concepts and a minimization of micromotion within the BII was found.

Using a Hill-type neuromuscular model we simulate squat jumps with different additional masses under the influence of different gravitational accelerations. Applying sensitivity analysis and the idea that training will improve the performance along the gradient of a performance function, we show the...

The implant failure for large defects is usually induced by unfavorable stress distribution due to unsuitable structural design in mandible reconstruction. Topology optimization is usually applied to solve structural optimization under one loading condition and cannot be applied to a specific mandib...

Healthy tibio-femoral kinematics are controversially discussed in the literature. In this study, 10 healthy subjects were assessed throughout dynamic functional gait activities using a moving fluoroscope to establish physiological healthy knee kinematics. Significantly larger range of anterior-poste...

Shear wave tensiometry is a non-invasive approach that enables the in vivo measurement of tendon stress based on wave propagation speed. Here, both transient and standing wave analyses are used to measure wave speed in isolated tendons subjected to cyclic axial loading. Wave speeds increased monoton...

In individuals with recurrent low back pain, symptom remission did not result in a return to back-healthy state of trunk control, based on kinematic coordination and muscle activity.

Although exercise therapy is recommended as one of the keystones of non-pharmacological treatment for spondyloartritis, an inflammatory rheumatological disease, little is known about which exercise regime is warranted. Data on spinal mobility and strength are scarce. Hence the aim of the current stu...

Biomechanics simulators must be validated before use to ensure accuracy and confidence in all future studies. A novel biomechanics simulator was validated with the use of optical motion tracking. The application of pure moments and accurate displacement control was confirmed.

Walking speed is one of the important factors in gait analysis. The purpose of the study is to examine the walking speed variation and biomechanical effects caused by the walking speed after wearing the Variable Stiffness Shoes (VSS). Twenty subjects were instructed to walk in three shod conditions,...

OpenSim was primarily developed for gait analysis in which external loads are only applied to the feet. When analyzing cycling in OpenSim, loads from the handlebars and seat are omitted as inputs. This study aims to investigate if OpenSim’s residual reduction algorithm (RRA) is capable of accounti...

Children with Autism Spectrum Disorder (ASD) have demonstrated differences in gait mechanics when compared to children with neurotypical (NT) development. A common intervention used to address the negative behavior associated with ASD is a weighted vest (WV). Contemporary research has revealed that ...

To quantify functional recovery of total hip replacement patients following surgery, vertical ground reaction forces (vGRF: “return to full weight bearing”) may be used. However, its association with hip contact forces remains unclear. In this work it is shown that the vGRF impulse is the most r...

In order to analyse the severity of sports impacts, time-frequency analysis of tibial acceleration can be performed with wavelet transform. However, a prerequisite to conduct such analysis is the selection of the mother wavelet. This study compared a set of 65 different wavelets on 2,240 tibial acce...

Although transient behavior has been reported for commonly used center of pressure parameters, the physiological relevance of this behavior is unclear. This study investigated these transient effects during eyes open and eyes closed stance in a healthy population. Although initial transient effects ...

This study found that sagittal plane trunk posture is associated with relative work contribution of hip and knee extensors during stance phase of running. Specifically, a more flexed trunk is related to less knee extensor work and greater hip extensor work contribution. The information may be utiliz...

The purpose of this study was to use Continuous Relative Phase (CRP) and CRP variability (CRPvar) to characterize coordination patterns in trunk, lumbar and pelvic regions in runners with a history of resolved LBP vs healthy controls (HC). While previous studies have looked at a resolved LBP in runn...

Hip muscle weakness is a risk factor for many musculoskeletal injuries to the hip and groin region. Instruments used to measure hip muscle strength are designed to assess muscle actions in a single plane, which is not consistent with the multiplanar line of action of many hip muscles. This study aim...

Deceleration-focused shoulder exercises are becoming integrated into both baseball and softball programs. These exercises address the imbalance between the shoulder internal and external rotator muscles. The effects of a deceleration-focused shoulder exercise program has yet to be examined among the...

The aim of this study was to compare hip and knee strength in asymptomatic active subjects with and without dynamic knee valgus (DKV). Sixty one active male subjects were evaluated, with DKV individuals (n=46) presenting weaker hip and knee strength compared to the group without DKV (n=15). No corre...

Balance control during quiet standing of patients with neurogenic claudication (NC) was less stable than healthy adults. However, the weighting of the sensory systems was not different between patients with NC and healthy adults. Therefore, other factors such as motor output systems should be determ...

The purpose of this research study was to examine how people maintain static and dynamic postural control when performing volitional head movements. Fifteen healthy young adults participated; each was assigned to a Head Direction group: Yaw, Pitch, or Roll. Participants performed the Sensory Organiz...