TPress
1.
Waterval, N. F. J.; Brehm, M. -A.; Harlaar, J.; Nollet, F.
In: J. NeuroEng. Rehabil., Bd. 18, Nr. 1, 2021, ISSN: 1743-0003.
Abstract | Links | Schlagwörter: adult, ankle foot orthosis, article, body weight, Carbon Ankle7, clinical effectiveness, correlational study, dorsal leaf spring ankle foot orthosis, energy cost, female, human, male, middle aged, muscle strength, muscle weakness, range of motion, risk factor, triceps surae muscle, walking speed
@article{Waterval2021,
title = {Individual stiffness optimization of dorsal leaf spring ankle-foot orthoses in people with calf muscle weakness is superior to standard bodyweight-based recommendations},
author = {N. F. J. Waterval and M. -A. Brehm and J. Harlaar and F. Nollet},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L2012344314&from=export},
doi = {10.1186/s12984-021-00890-8},
issn = {1743-0003},
year = {2021},
date = {2021-01-01},
journal = {J. NeuroEng. Rehabil.},
volume = {18},
number = {1},
address = {N.F.J. Waterval, Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, Netherlands},
abstract = {Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s},
keywords = {adult, ankle foot orthosis, article, body weight, Carbon Ankle7, clinical effectiveness, correlational study, dorsal leaf spring ankle foot orthosis, energy cost, female, human, male, middle aged, muscle strength, muscle weakness, range of motion, risk factor, triceps surae muscle, walking speed},
pubstate = {published},
tppubtype = {article}
}
Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s
2.
Shimizu, Y.; Mutsuzaki, H.; Maezawa, T.; Idei, Y.; Takao, K.; Takeuchi, R.; Onishi, S.; Hada, Y.; Yamazaki, M.; Wadano, Y.
In: Prosthet. Orthot. Int., Bd. 41, Nr. 5, S. 522–526, 2017, ISSN: 0309-3646.
Abstract | Links | Schlagwörter: adult, amputee, article, bilateral transfemoral amputee, burn, case report, clinical article, diabetes mellitus, dipeptidyl peptidase IV inhibitor, hemoglobin A1c, hip prosthesis, human, laminoplasty, leg amputation, male, middle aged, muscle strength, Ottobock, postoperative care, range of motion, sitting, skin transplantation, swan, SwanS, walking, wheelchair, wound healing
@article{Shimizu2017,
title = {Hip prosthesis in sitting posture for bilateral transfemoral amputee after burn injury: a case report},
author = {Y. Shimizu and H. Mutsuzaki and T. Maezawa and Y. Idei and K. Takao and R. Takeuchi and S. Onishi and Y. Hada and M. Yamazaki and Y. Wadano},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L618507994&from=export},
doi = {10.1177/0309364616682384},
issn = {0309-3646},
year = {2017},
date = {2017-01-01},
journal = {Prosthet. Orthot. Int.},
volume = {41},
number = {5},
pages = {522–526},
address = {Y. Shimizu, Department of Rehabilitation Medicine, University of Tsukuba Hospital, 2-1-1, Amakubo, Tsukuba, Ibaraki, Japan},
abstract = {Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.},
keywords = {adult, amputee, article, bilateral transfemoral amputee, burn, case report, clinical article, diabetes mellitus, dipeptidyl peptidase IV inhibitor, hemoglobin A1c, hip prosthesis, human, laminoplasty, leg amputation, male, middle aged, muscle strength, Ottobock, postoperative care, range of motion, sitting, skin transplantation, swan, SwanS, walking, wheelchair, wound healing},
pubstate = {published},
tppubtype = {article}
}
Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.
3.
Dosen, S.; Markovic, M.; Somer, K.; Graimann, B.; Farina, D.
EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis Artikel
In: J. NeuroEng. Rehabil., Bd. 12, Nr. 1, 2015, ISSN: 1743-0003.
Abstract | Links | Schlagwörter: adult, arm amputation, article, case report, computer interface, controlled study, EMG biofeedback, feedback system, grip strength, human, human computer interaction, Michelangelo hand, middle aged, muscle strength, myoelectric control, myoelectrically controlled prosthesis, online system, prediction, priority journal, Sensor Hand
@article{Dosen2015,
title = {EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis},
author = {S. Dosen and M. Markovic and K. Somer and B. Graimann and D. Farina},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L605002250&from=export},
doi = {10.1186/s12984-015-0047-z},
issn = {1743-0003},
year = {2015},
date = {2015-06-01},
journal = {J. NeuroEng. Rehabil.},
volume = {12},
number = {1},
publisher = {Springer Science and Business Media LLC},
address = {D. Farina, Department of Neurorehabilitation Engineering, University Medical Center Göttingen (UMG), Georg-August University, Göttingen, Germany},
abstract = {Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.},
keywords = {adult, arm amputation, article, case report, computer interface, controlled study, EMG biofeedback, feedback system, grip strength, human, human computer interaction, Michelangelo hand, middle aged, muscle strength, myoelectric control, myoelectrically controlled prosthesis, online system, prediction, priority journal, Sensor Hand},
pubstate = {published},
tppubtype = {article}
}
Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.
2021
Waterval, N. F. J.; Brehm, M. -A.; Harlaar, J.; Nollet, F.
In: J. NeuroEng. Rehabil., Bd. 18, Nr. 1, 2021, ISSN: 1743-0003.
Abstract | Links | Schlagwörter: adult, ankle foot orthosis, article, body weight, Carbon Ankle7, clinical effectiveness, correlational study, dorsal leaf spring ankle foot orthosis, energy cost, female, human, male, middle aged, muscle strength, muscle weakness, range of motion, risk factor, triceps surae muscle, walking speed
@article{Waterval2021,
title = {Individual stiffness optimization of dorsal leaf spring ankle-foot orthoses in people with calf muscle weakness is superior to standard bodyweight-based recommendations},
author = {N. F. J. Waterval and M. -A. Brehm and J. Harlaar and F. Nollet},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L2012344314&from=export},
doi = {10.1186/s12984-021-00890-8},
issn = {1743-0003},
year = {2021},
date = {2021-01-01},
journal = {J. NeuroEng. Rehabil.},
volume = {18},
number = {1},
address = {N.F.J. Waterval, Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, Netherlands},
abstract = {Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s},
keywords = {adult, ankle foot orthosis, article, body weight, Carbon Ankle7, clinical effectiveness, correlational study, dorsal leaf spring ankle foot orthosis, energy cost, female, human, male, middle aged, muscle strength, muscle weakness, range of motion, risk factor, triceps surae muscle, walking speed},
pubstate = {published},
tppubtype = {article}
}
Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s
2017
Shimizu, Y.; Mutsuzaki, H.; Maezawa, T.; Idei, Y.; Takao, K.; Takeuchi, R.; Onishi, S.; Hada, Y.; Yamazaki, M.; Wadano, Y.
In: Prosthet. Orthot. Int., Bd. 41, Nr. 5, S. 522–526, 2017, ISSN: 0309-3646.
Abstract | Links | Schlagwörter: adult, amputee, article, bilateral transfemoral amputee, burn, case report, clinical article, diabetes mellitus, dipeptidyl peptidase IV inhibitor, hemoglobin A1c, hip prosthesis, human, laminoplasty, leg amputation, male, middle aged, muscle strength, Ottobock, postoperative care, range of motion, sitting, skin transplantation, swan, SwanS, walking, wheelchair, wound healing
@article{Shimizu2017,
title = {Hip prosthesis in sitting posture for bilateral transfemoral amputee after burn injury: a case report},
author = {Y. Shimizu and H. Mutsuzaki and T. Maezawa and Y. Idei and K. Takao and R. Takeuchi and S. Onishi and Y. Hada and M. Yamazaki and Y. Wadano},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L618507994&from=export},
doi = {10.1177/0309364616682384},
issn = {0309-3646},
year = {2017},
date = {2017-01-01},
journal = {Prosthet. Orthot. Int.},
volume = {41},
number = {5},
pages = {522–526},
address = {Y. Shimizu, Department of Rehabilitation Medicine, University of Tsukuba Hospital, 2-1-1, Amakubo, Tsukuba, Ibaraki, Japan},
abstract = {Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.},
keywords = {adult, amputee, article, bilateral transfemoral amputee, burn, case report, clinical article, diabetes mellitus, dipeptidyl peptidase IV inhibitor, hemoglobin A1c, hip prosthesis, human, laminoplasty, leg amputation, male, middle aged, muscle strength, Ottobock, postoperative care, range of motion, sitting, skin transplantation, swan, SwanS, walking, wheelchair, wound healing},
pubstate = {published},
tppubtype = {article}
}
Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.
2015
Dosen, S.; Markovic, M.; Somer, K.; Graimann, B.; Farina, D.
EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis Artikel
In: J. NeuroEng. Rehabil., Bd. 12, Nr. 1, 2015, ISSN: 1743-0003.
Abstract | Links | Schlagwörter: adult, arm amputation, article, case report, computer interface, controlled study, EMG biofeedback, feedback system, grip strength, human, human computer interaction, Michelangelo hand, middle aged, muscle strength, myoelectric control, myoelectrically controlled prosthesis, online system, prediction, priority journal, Sensor Hand
@article{Dosen2015,
title = {EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis},
author = {S. Dosen and M. Markovic and K. Somer and B. Graimann and D. Farina},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L605002250&from=export},
doi = {10.1186/s12984-015-0047-z},
issn = {1743-0003},
year = {2015},
date = {2015-06-01},
journal = {J. NeuroEng. Rehabil.},
volume = {12},
number = {1},
publisher = {Springer Science and Business Media LLC},
address = {D. Farina, Department of Neurorehabilitation Engineering, University Medical Center Göttingen (UMG), Georg-August University, Göttingen, Germany},
abstract = {Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.},
keywords = {adult, arm amputation, article, case report, computer interface, controlled study, EMG biofeedback, feedback system, grip strength, human, human computer interaction, Michelangelo hand, middle aged, muscle strength, myoelectric control, myoelectrically controlled prosthesis, online system, prediction, priority journal, Sensor Hand},
pubstate = {published},
tppubtype = {article}
}
Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.
2021
Waterval, N. F. J.; Brehm, M. -A.; Harlaar, J.; Nollet, F.
In: J. NeuroEng. Rehabil., Bd. 18, Nr. 1, 2021, ISSN: 1743-0003.
@article{Waterval2021,
title = {Individual stiffness optimization of dorsal leaf spring ankle-foot orthoses in people with calf muscle weakness is superior to standard bodyweight-based recommendations},
author = {N. F. J. Waterval and M. -A. Brehm and J. Harlaar and F. Nollet},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L2012344314&from=export},
doi = {10.1186/s12984-021-00890-8},
issn = {1743-0003},
year = {2021},
date = {2021-01-01},
journal = {J. NeuroEng. Rehabil.},
volume = {18},
number = {1},
address = {N.F.J. Waterval, Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, Netherlands},
abstract = {Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Background: In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle-foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods: Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results: In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s
2017
Shimizu, Y.; Mutsuzaki, H.; Maezawa, T.; Idei, Y.; Takao, K.; Takeuchi, R.; Onishi, S.; Hada, Y.; Yamazaki, M.; Wadano, Y.
In: Prosthet. Orthot. Int., Bd. 41, Nr. 5, S. 522–526, 2017, ISSN: 0309-3646.
@article{Shimizu2017,
title = {Hip prosthesis in sitting posture for bilateral transfemoral amputee after burn injury: a case report},
author = {Y. Shimizu and H. Mutsuzaki and T. Maezawa and Y. Idei and K. Takao and R. Takeuchi and S. Onishi and Y. Hada and M. Yamazaki and Y. Wadano},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L618507994&from=export},
doi = {10.1177/0309364616682384},
issn = {0309-3646},
year = {2017},
date = {2017-01-01},
journal = {Prosthet. Orthot. Int.},
volume = {41},
number = {5},
pages = {522–526},
address = {Y. Shimizu, Department of Rehabilitation Medicine, University of Tsukuba Hospital, 2-1-1, Amakubo, Tsukuba, Ibaraki, Japan},
abstract = {Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Background: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel “hip prosthesis in the sitting posture.” Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises. Findings and Outcomes: The patient’s refractory wounds healed 1 month after initiating exercises using hip prosthesis in the sitting posture, and he could begin rehabilitation with the standard prostheses. Discussion and Conclusion: Hip prosthesis in the sitting posture enabled a bilateral transfemoral amputee with unhealed residual limbs to stand, walk, and begin balance training. Hip prosthesis in the sitting posture is an effective temporary prosthesis to prevent disuse until wounds are healed and to continue rehabilitation with standard prostheses. Clinical relevance: Hip prosthesis in the sitting posture is useful for bilateral transfemoral amputees with unhealed residual limbs after burn injuries to prevent disuse and maintain motivation for walking.
2015
Dosen, S.; Markovic, M.; Somer, K.; Graimann, B.; Farina, D.
EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis Artikel
In: J. NeuroEng. Rehabil., Bd. 12, Nr. 1, 2015, ISSN: 1743-0003.
@article{Dosen2015,
title = {EMG Biofeedback for online predictive control of grasping force in a myoelectric prosthesis},
author = {S. Dosen and M. Markovic and K. Somer and B. Graimann and D. Farina},
url = {https://www.embase.com/search/results?subaction=viewrecord&id=L605002250&from=export},
doi = {10.1186/s12984-015-0047-z},
issn = {1743-0003},
year = {2015},
date = {2015-06-01},
journal = {J. NeuroEng. Rehabil.},
volume = {12},
number = {1},
publisher = {Springer Science and Business Media LLC},
address = {D. Farina, Department of Neurorehabilitation Engineering, University Medical Center Göttingen (UMG), Georg-August University, Göttingen, Germany},
abstract = {Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Background: Active hand prostheses controlled using electromyography (EMG) signals have been used for decades to restore the grasping function, lost after an amputation. Although myocontrol is a simple and intuitive interface, it is also imprecise due to the stochastic nature of the EMG recorded using surface electrodes. Furthermore, the sensory feedback from the prosthesis to the user is still missing. In this study, we present a novel concept to close the loop in myoelectric prostheses. In addition to conveying the grasping force (system output), we provided to the user the online information about the system input (EMG biofeedback). Methods: As a proof-of-concept, the EMG biofeedback was transmitted in the current study using a visual interface (ideal condition). Ten able-bodied subjects and two amputees controlled a state-of-the-art myoelectric prosthesis in routine grasping and force steering tasks using EMG and force feedback (novel approach) and force feedback only (classic approach). The outcome measures were the variability of the generated forces and absolute deviation from the target levels in the routine grasping task, and the root mean square tracking error and the number of sudden drops in the force steering task. Results: During the routine grasping, the novel method when used by able-bodied subjects decreased twofold the force dispersion as well as absolute deviations from the target force levels, and also resulted in a more accurate and stable tracking of the reference force profiles during the force steering. Furthermore, the force variability during routine grasping did not increase for the higher target forces with EMG biofeedback. The trend was similar in the two amputees. Conclusions: The study demonstrated that the subjects, including the two experienced users of a myoelectric prosthesis, were able to exploit the online EMG biofeedback to observe and modulate the myoelectric signals, generating thereby more consistent commands. This allowed them to control the force predictively (routine grasping) and with a finer resolution (force steering). The future step will be to implement this promising and simple approach using an electrotactile interface. A prosthesis with a reliable response, following faithfully user intentions, would improve the utility during daily-life use and also facilitate the embodiment of the assistive system.