1,721,352 research outputs found
Validation of plantar pressure measurements for a novel in-shoe plantar sensory replacement unit.
Full text linkAn article by Ferber and coauthors in Journal of Diabetes Science and Technology reported on the ability of a novel in-shoe plantar sensory replacement unit (PSRU) to provide alert-based feedback derived from analyzing plantar pressure (PP) threshold measurements in real time. The study aimed at comparing the PSRU device to a gold standard pressure-sensing device (GS-PSD) to determine the correlation between concurrent measures of PP during walking. Data were collected simultaneously from 10 participants who walked overground with both devices. The variable of interest was the number of recorded data points greater than 32 mmHg for each of the PSRU sensors and corresponding average recordings from the GS-PSD. Authors concluded that the PSRU provides analogous data to the GS-PSD. However, several aspects of the study should be considered when interpreting their clinical relevance
Comparison of markerless and marker-based motion capture technologies through simultaneous data collection during gait.
Full text linkDuring the last decade markerless motion capture techniques have gained an increasing interest in the biomechanics community. In the clinical field, however, the application of markerless techniques is still debated. This is mainly due to a limited number of papers dedicated to the comparison with the state of the art of marker based motion capture, in term of repeatability of the three dimensional joints' kinematics. In the present work the application of markerless technique to data acquired with a marker-based system was investigated. All videos and external data were recorded with the same motion capture system and included the possibility to use markerless and marker-based methods simultaneously. Three dimensional markerless joint kinematics was estimated and compared with the one determined with traditional marker based systems, through the evaluation of root mean square distance between joint rotations. In order to compare the performance of markerless and marker-based systems in terms of clinically relevant joint angles estimation, the same anatomical frames of reference were defined for both systems. Differences in calibration and synchronization of the cameras were excluded by applying the same wand calibration and lens distortion correction to both techniques. Best results were achieved for knee flexion-extension angle, with an average root mean square distance of 11.75 deg, corresponding to 18.35% of the range of motion. Sagittal plane kinematics was estimated better than on the other planes also for hip and ankle (root mean square distance of 17.62 deg e.g. 44.66%, and 7.17 deg e.g. 33.12%), meanwhile estimates for hip joint were the most incorrect. This technique enables users of markerless technology to compare differences with marker-based in order to define the degree of applicability of markerless technique
A multi-scale framework for the prevention of plantar ulcers in diabetic subjects: a multidisciplinary approach combining gait analysis, musculkoskeletal and finite element foot modelling.
Full text linkThis study aims to evaluate the accuracy of a multiscale workflow applicable in clinical practice aiming to prevent ulceration by detecting excessive external and internal stresses preceding overloading and breakdown in diabetic subjects
Different foot kinematics, kinetics and plantar pressure patterns within the gait of diabetic subjects: cluster analysis
No full textBiomechanical analysis of three different blocking footwork techniques in volleyball: a pilot study.
No full textChapter 22 - Finite element modelling in musculoskeletal biomechanics
No full textNumerical approximation of the solutions to boundary value problems, by means of finite element analysis, has proven to be of significant benefit to the field of musculoskeletal biomechanics. The human musculoskeletal system is a complex mechanism. The principal function of this apparatus is the transmission of mechanical loads, both in terms of tissues and organs. The dynamic, three-dimensional kinematics of the joints are evaluated through noninvasive methodologies using stereophotogrammetry, force plates coupled to advanced musculoskeletal modelling software, and image segmentation methods. The measured variables (kinematics and ground reaction forces) allow the simulation of the whole musculoskeletal system and the determination of the forces acting locally on each joint. The local mechanical response of musculoskeletal joints is then studied through finite element computer simulations from the scale of the whole body down to the organ level
Could foot kinematics be used to predict the distribution of vertical force in multisegment foot models?
No full textSubject-specific modelling of the foot integrating finite element modelling, gait analysis and opensim: proof of concept in diabetic neuropathic subjects
No full textDiabetics subjects kinetics is influenced by the computational technique adopted in joint rotation moment estimation?
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