scholarly journals Design of a stepwise safety protocol for lower limb prosthetic risk management in a clinical investigation

2021 ◽  
Author(s):  
Alexander Thesleff ◽  
Bahareh Ahkami ◽  
Jenna Anderson ◽  
Kerstin Hagberg ◽  
Max Ortiz-Catalan
Keyword(s):  
Control Systems ◽  
Lower Limb ◽  
Fear Of Falling ◽  
Clinical Investigation ◽  
Research Participant ◽  
Laboratory Bench ◽  
Loss Of Balance ◽  
Independent Ambulation ◽  
Bench Testing ◽  
And Training

<p><a>In research on lower limb prostheses, safety during testing and training is paramount. Lower limb prosthetic users risk unintentional loss of balance that can result in injury, fear of falling, and overall decreased confidence in their prosthetic leg. Here, we present a protocol for managing the risks during evaluation of active prosthetic legs with modifiable control systems. We propose graded safety levels, each of which must be achieved before advancing to the next one, from laboratory bench testing to independent ambulation in real-world environments. This ensures safety for the research participant and staff.</a></p>

scholarly journals Design of a stepwise safety protocol for lower limb prosthetic risk management in a clinical investigation

2021 ◽  
Author(s):  
Alexander Thesleff ◽  
Bahareh Ahkami ◽  
Jenna Anderson ◽  
Kerstin Hagberg ◽  
Max Ortiz-Catalan
Keyword(s):  
Control Systems ◽  
Lower Limb ◽  
Fear Of Falling ◽  
Clinical Investigation ◽  
Research Participant ◽  
Laboratory Bench ◽  
Loss Of Balance ◽  
Independent Ambulation ◽  
Bench Testing ◽  
And Training

<p><a>In research on lower limb prostheses, safety during testing and training is paramount. Lower limb prosthetic users risk unintentional loss of balance that can result in injury, fear of falling, and overall decreased confidence in their prosthetic leg. Here, we present a protocol for managing the risks during evaluation of active prosthetic legs with modifiable control systems. We propose graded safety levels, each of which must be achieved before advancing to the next one, from laboratory bench testing to independent ambulation in real-world environments. This ensures safety for the research participant and staff.</a></p>

scholarly journals A novel biomechanical injury risk score demonstrates correlation with lower limb posterior chain injury in fifty elite level rugby union athletes

2021 ◽  
Author(s):  
Rhys Hughes ◽  
Matt Cross ◽  
Keith Stokes
Keyword(s):  
Risk Score ◽  
Lower Limb ◽  
Injury Risk ◽  
Assessment Tool ◽  
Rugby Union ◽  
Biomechanical Assessment ◽  
Elite Level ◽  
Hip Extension ◽  
Spearman’S Correlation ◽  
And Training

ABSTRACTObjectivesLower limb posterior chain injury (PCI) is common amongst athletic populations, with multi-factorial risk factors including age, previous injury, strength measurements, range of motion and training load. Biomechanics are commonly considered in the prevention and rehabilitation of PCI by performance staff. However, there is no documented testing method to assess for associations between biomechanics and PCI. The aim of this study was to investigate whether there is an association between an easily applicable, novel biomechanical assessment tool and PCI.MethodsFifty male elite-level rugby union athletes (age 22.83±5.08) participating in the highest tier of England were tested at the start of the 2019 pre-season period and PCIs (N=48) were recorded over the 2019/20 playing season. Participants’ biomechanics were analysed using two-dimensional video analysis against an Injury Risk Score (IRS) system in the performance of the combined movement – prone hip extension and knee flexion. Participants’ biomechanics in carrying out this movement were scored against the 10-point IRS, where the more compensatory movement recorded sees an increase in an individual’s IRS. Participants’ IRS were then compared against the number of PCI sustained and Spearman’s correlation coefficient was utilised for analysis.ResultsThere is a good significant association between IRS and PCI (R=0.573, p<0.001). Linear Regression demonstrated that an increase of 1 in IRS was associated with a 35% increase in PCI incidence (R2=0.346).ConclusionA good significance between the IRS and PCI provides preliminary support for its use as an injury risk assessment tool.

scholarly journals Time-Frequency Linearization of Reactive Cortical Responses for the Early Detection of Balance Losses

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Giovanni Mezzina ◽  
Daniela De Venuto
Keyword(s):  
Lower Limb ◽  
Fall Detection ◽  
Time Frequency ◽  
Average Value ◽  
Cortical Responses ◽  
Loss Of Balance ◽  
Spectrum Density ◽  
System Functioning ◽  
Limb Kinematics ◽  
Lower Limb Kinematics

Aiming at finding a fast and accurate preimpact fall detection (PIFD) strategy, this paper proposes a novel methodology that precociously discriminates the occurrence of unexpected loss of balance from the steady walking, by analyzing the subject’s cortical signal modifications (at the scalp level) in the time-frequency domain. In this study, the subjects were asked to walk at their preferred speed on the treadmill platform programmed to provide unexpected bilateral slippages. The proposed PIFD method exploits synchronously recorded electromyographic (EMG: 2 channels from the same lower limb muscle bundle, bilaterally) and electro-encephalographic (EEG: 13 channels from motor, sensory-motor and parietal cortex areas) signals. To validate the method offline, also, the lower limb kinematics has been reconstructed via a motion capture system (23 reflective markers and 8 fixed cameras). During the PIFD system functioning, the EMG signals from the lateral gastrocnemii are first translated in a binary waveform and then used to trigger the EEG analysis. Once enabled via EMG (every gait cycle), the EEG computation branch extracts and linearizes the rate of variation in the EEG power spectrum density (PSD) for five bands of interests: θ (4–7 Hz), α (8–12 Hz), β I, β II, β III rhythms (13–15 Hz, 16–20 Hz, and 21–28 Hz). The slope of the linearized trend identifies, in this context, the cortical responsiveness parameter. Experimental results from six subjects revealed that the proposed system can distinguish the loss of balance with an overall accuracy of ~96% (average value between sensitivity and specificity). The discrimination process requests, on average, 370.6 ms. This value could be considered suitable for the implementation of countermeasures aimed at restoring the balance of the subject.

A Computer Experiment on Man-Machine Interaction

1998 ◽  
Vol 26 (2) ◽  
pp. 133-142 ◽  
Author(s):  
N. Aydin Hizal
Keyword(s):  
Computer Program ◽  
Automatic Control ◽  
Control Systems ◽  
Computer Experiment ◽  
Continuous Control ◽  
Operator Training ◽  
Interaction Experiment ◽  
Machine Interaction ◽  
And Training ◽  
Selection Of

A man-machine interaction experiment in the real-time continuous control sense is presented. The computer program is given and described, together with some representative results with regard to plant order, display effects and training effects. In particular, the importance of the selection of the displayed variable is emphasized. The experiment has been helpful in the appreciation of the effects of display gain selection and the inclusion of the derivative terms in the displayed variable, as well as demonstrating the importances of plant order and operator training, by allowing time response shape and criterion value comparisons. The nature of the conclusions reached can be generalized to automatic control, helping students of control systems.

Lower limb muscle moments and power during recovery from forward loss of balance in male and female single and multiple steppers

2012 ◽  
Vol 27 (10) ◽  
pp. 1031-1037 ◽  
Author(s):  
Christopher P. Carty ◽  
Neil J. Cronin ◽  
Glen A. Lichtwark ◽  
Peter M. Mills ◽  
Rod S. Barrett
Keyword(s):  
Lower Limb ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Male And Female ◽  
Loss Of Balance ◽  
Muscle Moments

scholarly journals Design of a stepwise safety protocol for lower limb prosthetic risk management in a clinical investigation

2021 ◽  
Author(s):  
Alexander Thesleff ◽  
Bahareh Ahkami ◽  
Jenna Anderson ◽  
Kerstin Hagberg ◽  
Max Ortiz-Catalan
Keyword(s):  
Risk Management ◽  
Lower Limb ◽  
Clinical Investigation

scholarly journals The concept of research and training simulator for testing car assistive devices for physically disabled drivers

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 573-575
Author(s):  
Jarosław Jankowski ◽  
Andrzej Grabowski
Keyword(s):  
Social Exclusion ◽  
Lower Limb ◽  
Motor Vehicle ◽  
People With Disabilities ◽  
Assistive Devices ◽  
Motion Platform ◽  
Training Simulator ◽  
Projection System ◽  
Image Projection ◽  
And Training

Presented are the assumptions and a description of the work carried out as part of the action on the development of a project to assist the prevention of social exclusion of people with disabilities. The developed research and training simulator for a car with a weight of up to 3.5 tons will allow the study of the suitability of various solutions enabling the driving of a motor vehicle for people with upper and lower limb dysfunctions. This simulator equipped with a driver’s cockpit attached to the motion platform, platform, image projection system and application will be tested with the participation of 20 people.

Lower-limb muscle strength, static and dynamic postural stabilities, risk of falling and fear of falling in polio survivors and healthy subjects

2018 ◽  
Vol 36 (8) ◽  
pp. 899-906 ◽  
Author(s):  
Thaiana Santos Galvão ◽  
Egídio Sabino Magalhães Júnior ◽  
Marco Antonio Orsini Neves ◽  
Arthur de Sá Ferreira
Keyword(s):  
Muscle Strength ◽  
Lower Limb ◽  
Healthy Subjects ◽  
Fear Of Falling ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Risk Of Falling ◽  
Polio Survivors
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