Dealing with time-varying recruitment and length in Hill-type muscle models

Hamouda, A; Kenney, LPJ; Howard, D

doi:10.1016/j.jbiomech.2016.08.030

3D Printing in LMICs: functional design for upper limb prosthetics in Uganda (2023)
Journal Article
Hussaini, A., Kyberd, P., Mulindwa, B., Ssekitoleko, R., Keeble, W., Kenney, L., & Howard, D. (2023). 3D Printing in LMICs: functional design for upper limb prosthetics in Uganda. Prosthesis, 5(1), 130-147. https://doi.org/10.3390/prosthesis5010011

Meeting the needs of persons with upper limb loss in Uganda requires an understanding of the needs and desires of the local population. The limitations of resources and accessibility for the individual gave rise to a focused design methodology fo... Read More about 3D Printing in LMICs: functional design for upper limb prosthetics in Uganda.

A three-dimensional whole-body model to predict human walking on level ground (2022)
Journal Article
Hu, D., Howard, D., & Ren, L. (2022). A three-dimensional whole-body model to predict human walking on level ground. Biomechanics and Modeling in Mechanobiology, https://doi.org/10.1007/s10237-022-01629-7

Predictive simulation of human walking has great potential in clinical motion analysis and rehabilitation engineering assessment, but large computational cost and reliance on measurement data to provide initial guess have limited its wide use. We dev... Read More about A three-dimensional whole-body model to predict human walking on level ground.

Simulated performance of an energy storage and return prosthetic ankle based on cams and miniature hydraulics (2022)
Journal Article
Pace, A., Gardiner, J., Kenney, L., & Howard, D. (2022). Simulated performance of an energy storage and return prosthetic ankle based on cams and miniature hydraulics. IEEE Transactions on Medical Robotics and Bionics, https://doi.org/10.1109/TMRB.2022.3146628

Prosthetic feet are limited in their ability to mimic the energy-recycling behaviour of an intact ankle, negatively affecting lower-limb amputees’ gait in terms of metabolic cost and walking speed. To overcome these weaknesses, a novel prosthetic ank... Read More about Simulated performance of an energy storage and return prosthetic ankle based on cams and miniature hydraulics.

Effects of a modified passive socket system on short-term changes in residuum volume and comfort: A preliminary study in transtibial amputees (2021)
Journal Article
Atallah, H., Kenney, L., Howard, D., Liu, A., & Head, J. (2021). Effects of a modified passive socket system on short-term changes in residuum volume and comfort: A preliminary study in transtibial amputees. Prosthetics and Orthotics International, 46(1), 54-60. https://doi.org/10.1097/pxr.0000000000000053

Background: Changes in residuum volume are a common problem in lower-limb amputees during prosthesis usage, and can lead to poor suspension, impaired gait, and tissue damage. Residuum volume can be affected by the in-socket air pressure, which will i... Read More about Effects of a modified passive socket system on short-term changes in residuum volume and comfort: A preliminary study in transtibial amputees.

An investigation of the effects of walking frame height and width on walking stability (2020)
Journal Article
Thies, S., Russell, R., Al-ani, A., Belet, T., Bates, A., Costamagna, E., …Howard, D. (2020). An investigation of the effects of walking frame height and width on walking stability. Gait & Posture, 82, 248-253. https://doi.org/10.1016/j.gaitpost.2020.09.017

Background Walking aids are designed for structural support during walking, however, surprisingly self-reported use of a walking aid (“Yes, I use one.”) has been identified as a risk factor for falling. Adjustment and design of walking aids may affe... Read More about An investigation of the effects of walking frame height and width on walking stability.

A pin-array method for capturing tissue deformation under defined pressure distributions and its application to prosthetic socket design (2020)
Journal Article
Prince, M., Kenney, L., & Howard, D. (2020). A pin-array method for capturing tissue deformation under defined pressure distributions and its application to prosthetic socket design. Medical Engineering and Physics, 84, 136-143. https://doi.org/10.1016/j.medengphy.2020.08.003

The Fit4Purpose project aims to develop upper limb prosthetic devices which are suitable for deployment in lower- and middle-income countries (LMIC's). Open-frame trans-radial socket designs are being considered, formed of several, linked components,... Read More about A pin-array method for capturing tissue deformation under defined pressure distributions and its application to prosthetic socket design.

Evaluating reachable workspace and user control over prehensor aperture for a body-powered prosthesis (2020)
Journal Article
Chadwell, A., Kenney, L., Howard, D., Ssekitoleko, R., Nakandi, B., & Head, J. (2020). Evaluating reachable workspace and user control over prehensor aperture for a body-powered prosthesis. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 28(9), 2005-2014. https://doi.org/10.1109/TNSRE.2020.3010625

Using a shoulder harness and control cable, a person can control the opening and closing of a bodypowered prosthesis prehensor. In many setups the cable does not pass adjacent to the shoulder joint center allowing shoulder flexion on the prostheti... Read More about Evaluating reachable workspace and user control over prehensor aperture for a body-powered prosthesis.

Are older people putting themselves at risk when using their walking frames? (2020)
Journal Article
Thies, S., Bates, A., Costamagna, E., Kenney, L., Granat, M., Webb, J., …Dawes, H. (2020). Are older people putting themselves at risk when using their walking frames?. BMC Geriatrics, 20(1), 90. https://doi.org/10.1186/s12877-020-1450-2

Background Walking aids are issued to older adults to prevent falls, however, paradoxically their use has been identified as a risk factor for falling. To prevent falls, walking aids must be used in a stable manner, but it remains unknown to what ext... Read More about Are older people putting themselves at risk when using their walking frames?.

A three-site clinical feasibility study of a flexible functional electrical stimulation system to support functional task practice for upper limb recovery in people with stroke (2019)
Journal Article
Smith, C., Sun, M., Kenney, L., Howard, D., Luckie, H., Waring, K., …Cotterill, S. (2019). A three-site clinical feasibility study of a flexible functional electrical stimulation system to support functional task practice for upper limb recovery in people with stroke. Frontiers in Neurology, 10(227), https://doi.org/10.3389/fneur.2019.00227

Introduction: Of those people who survive a stroke, only between 40 and 70% regain upper limb dexterity. A number of reviews have suggested that functional electrical stimulation (FES) may have a beneficial effect on upper limb motor recovery. In lig... Read More about A three-site clinical feasibility study of a flexible functional electrical stimulation system to support functional task practice for upper limb recovery in people with stroke.

An investigation into the effects of, and interaction between, heel height and shoe upper stiffness on plantar pressure and comfort (2019)
Journal Article
Melvin, J., Price, C., Preece, S., Nester, C., & Howard, D. (2019). An investigation into the effects of, and interaction between, heel height and shoe upper stiffness on plantar pressure and comfort. Footwear Science, 11(1), 25-34. https://doi.org/10.1080/19424280.2018.1555862

High heeled shoes remain popular, nevertheless it is not clear what influence manipulating characteristics of this footwear has on their functioning. It is accepted that shoe features other than heel height can affect plantar pressures. However, few... Read More about An investigation into the effects of, and interaction between, heel height and shoe upper stiffness on plantar pressure and comfort.

Objective measures of rollator user stability and device loading during different walking scenarios (2019)
Journal Article
Costamagna, E., Thies, S., Kenney, L., Howard, D., Lindemann, U., Klenk, J., & Baker, R. (2019). Objective measures of rollator user stability and device loading during different walking scenarios. PLoS ONE, 14(1), e0210960. https://doi.org/10.1371/journal.pone.0210960

Walking aids are widely used by older adults, however, alarmingly, their use has been linked to increased falls-risk, yet clinicians have no objective way of assessing user stability. This work aims to demonstrate the application of a novel methodolo... Read More about Objective measures of rollator user stability and device loading during different walking scenarios.

FES-UPP : a flexible functional electrical stimulation system to support upper limb functional activity practice (2018)
Journal Article
Sun, M., Smith, C., Howard, D., Kenney, L., Luckie, H., Waring, K., …Finn, S. (2018). FES-UPP : a flexible functional electrical stimulation system to support upper limb functional activity practice. Frontiers in Neuroscience, 12(449), https://doi.org/10.3389/fnins.2018.00449

There is good evidence supporting highly intensive, repetitive, activity-focused, voluntary-initiated practice as a key to driving recovery of upper limb function following stroke. Functional electrical stimulation (FES) offers a potential mechanism... Read More about FES-UPP : a flexible functional electrical stimulation system to support upper limb functional activity practice.

Performance of optimised prosthetic ankle designs that are based on a hydraulic variable displacement actuator (VDA) (2017)
Journal Article
Gardiner, J., Bari, A., Kenney, L., Twiste, M., Moser, D., Zahedi, S., & Howard, D. (2017). Performance of optimised prosthetic ankle designs that are based on a hydraulic variable displacement actuator (VDA). IEEE Transactions on Neural Systems and Rehabilitation Engineering, 25(12), 2418-2426. https://doi.org/10.1109/TNSRE.2017.2763999

Current energy storage and return (ESR) prosthetic feet only marginally reduce the cost of amputee locomotion compared to basic solid ankle cushioned heel (SACH) feet, possibly due to their lack of push-off at the end of stance. To our knowledge,... Read More about Performance of optimised prosthetic ankle designs that are based on a hydraulic variable displacement actuator (VDA).

A generalizable methodology for stability assessment of walking aid users (2017)
Journal Article
Costamagna, E., Thies, S., Kenney, L., Howard, D., Liu, A., & Ogden, D. (2017). A generalizable methodology for stability assessment of walking aid users. Medical Engineering and Physics, 47, 167-175. https://doi.org/10.1016/j.medengphy.2017.06.013

To assist balance and mobility, older adults are often prescribed walking aids. Nevertheless, surprisingly their use has been associated with increased falls-risk. To address this finding we first need to characterise a person’s stability while using... Read More about A generalizable methodology for stability assessment of walking aid users.

Closed-loop control of compression paddle motion to reduce blurring in mammograms (2017)
Journal Article
Ma, W., Hogg, P., & Howard, D. (2017). Closed-loop control of compression paddle motion to reduce blurring in mammograms. Medical Physics, 44(8), 4139-4147. https://doi.org/10.1002/mp.12333

Background: Since the introduction of full field digital mammography (FFDM) a large number of UK breast cancer screening centers have reported blurred images, which can be caused by movement at the compression paddle during image acquisition. Purpos... Read More about Closed-loop control of compression paddle motion to reduce blurring in mammograms.

Estimating the material properties of heel pad sub-layers using inverse finite element analysis (2016)
Journal Article
Ahanchian, N., Nester, C., Howard, D., Ren, L., & Parker, D. (2016). Estimating the material properties of heel pad sub-layers using inverse finite element analysis. Medical Engineering and Physics, 40, 11-19. https://doi.org/10.1016/j.medengphy.2016.11.003

Detailed information about the biomechanical behaviour of plantar heel pad tissue contributes to our understanding of load transfer when the foot impacts the ground. The objective of this work was to obtain the hyperelastic and viscoelastic material... Read More about Estimating the material properties of heel pad sub-layers using inverse finite element analysis.

Energy flow analysis of amputee walking shows a proximally-directed transfer of energy in intact limbs, compared to a distally-directed transfer in prosthetic limbs at push-off (2016)
Journal Article
Weinert-Aplin, R., Howard, D., Twiste, M., Jarvis, H., Bennett, A., & Baker, R. (2017). Energy flow analysis of amputee walking shows a proximally-directed transfer of energy in intact limbs, compared to a distally-directed transfer in prosthetic limbs at push-off. Medical Engineering and Physics, 39, 73-82. https://doi.org/10.1016/j.medengphy.2016.10.005

Reduced capacity and increased metabolic cost of walking occurs in amputees, despite advances in prosthetic componentry. Joint powers can quantify deficiencies in prosthetic gait, but do not reveal how energy is exchanged between limb segments. This... Read More about Energy flow analysis of amputee walking shows a proximally-directed transfer of energy in intact limbs, compared to a distally-directed transfer in prosthetic limbs at push-off.

Crowd-sourced amputee gait data : a feasibility study using YouTube videos of unilateral trans-femoral gait (2016)
Journal Article
Gardiner, J., Gunarathne, N., Howard, D., & Kenney, L. (2016). Crowd-sourced amputee gait data : a feasibility study using YouTube videos of unilateral trans-femoral gait. PLoS ONE, 11(10), e0165287. https://doi.org/10.1371/journal.pone.0165287

Collecting large datasets of amputee gait data is notoriously difficult. Additionally, collecting data on less prevalent amputations or on gait activities other than level walking and running on hard surfaces is rarely attempted. However, with the we... Read More about Crowd-sourced amputee gait data : a feasibility study using YouTube videos of unilateral trans-femoral gait.

A review of the design and clinical evaluation of the ShefStim array-based functional electrical stimulation system (2016)
Journal Article
Kenney, L., Heller, B., Barker, A., Reeves, M., Healey, J., Good, T., …Howard, D. (2016). A review of the design and clinical evaluation of the ShefStim array-based functional electrical stimulation system. Medical Engineering and Physics, 38(11), 1159 -1165. https://doi.org/10.1016/j.medengphy.2016.08.005

Functional electrical stimulation has been shown to be a safe and effective means of correcting foot drop of central neurological origin. Current surface-based devices typically consist of a single channel stim- ulator, a sensor for determining gait... Read More about A review of the design and clinical evaluation of the ShefStim array-based functional electrical stimulation system.

Dealing with time-varying recruitment and length in Hill-type muscle models (2016)
Journal Article
Hamouda, A., Kenney, L., & Howard, D. (2016). Dealing with time-varying recruitment and length in Hill-type muscle models. Journal of Biomechanics, 49(14), 3375-3380. https://doi.org/10.1016/j.jbiomech.2016.08.030

Hill-type muscle models are often used in muscle simulation studies and also in the design and virtual prototyping of functional electrical stimulation systems. These models have to behave in a sufficiently realistic manner when recruitment level a... Read More about Dealing with time-varying recruitment and length in Hill-type muscle models.

All Outputs (76)