Immediate Effect of a Powered Prosthetic Knee on Loading Asymmetry During Sit-to-Stand Tasks in Individuals With Unilateral Transfemoral Amputation
Journal of Prosthetics and Orthotics | Volume 38, Issue 3 | July 2026 | Pages e103-e107
Authors: Hiroaki Hobara, Yukihiko Mizuno, Ryota Morishima, Takeshi Hara, Daisuke Kaneishi, Masahiro Komuta, and Xiaojun Sun
The study evaluated eight individuals with unilateral transfemoral amputation as they completed sit-to-stand tasks using their daily-use prostheses and then a powered prosthetic knee. The powered knee produced an immediate improvement in loading symmetry, indicating more balanced weight distribution between the prosthetic and intact limbs during the movement.
PEER-REVIEWED RESEARCH
Published findings on sit-to-stand performance.
BionicM and its research collaborators have presented findings at leading orthotics and prosthetics meetings. These presentations highlight developing research across sit-to-stand performance, gait, standing balance, and biomechanical measurement.
Explore ongoing clinical research, peer-reviewed publications, and scientific presentations examining powered prosthetic knee technology, movement performance, and functional outcomes.
Adaptive Mobility Technology: A Comparative Study of Bio Leg® and C-Leg
BionicM USA LLC + Brooks Rehabilitation | Exploratory pilot study
Adults with unilateral transfemoral amputation complete assessments using their current microprocessor-controlled prosthetic knee, followed by evaluation after acclimation to Bio Leg®. The study uses clinical testing, biomechanical analysis, and patient-reported measures to examine movement quality, efficiency, functional performance, and user experience.
ONGOING CLINICAL STUDY
Comparing powered assistance in real-world mobility.
BionicM USA LLC and Brooks Rehabilitation are conducting a collaborative study to evaluate functional mobility outcomes associated with the Bio Leg® powered prosthetic knee.
Adaptive Mobility Technology: A Comparative Study of Bio Leg® and C-Leg
BionicM USA LLC + Brooks Rehabilitation | Exploratory pilot study
Adults with unilateral transfemoral amputation complete assessments using their current microprocessor-controlled prosthetic knee, followed by evaluation after acclimation to Bio Leg®. The study uses clinical testing, biomechanical analysis, and patient-reported measures to examine movement quality, efficiency, functional performance, and user experience.
Peer-reviewed research provides a more detailed view of how powered prosthetic knee assistance may influence functional movement.
2026
Immediate Effect of a Powered Prosthetic Knee on Loading Asymmetry During Sit-to-Stand Tasks in Individuals With Unilateral Transfemoral Amputation
Journal of Prosthetics and Orthotics
Hiroaki Hobara, Yukihiko Mizuno, Ryota Morishima, Takeshi Hara, Daisuke Kaneishi, Masahiro Komuta, Xiaojun Sun
2026
Investigates whether a newly developed powered prosthetic knee reduces vertical ground reaction force asymmetry during sit-to-stand in individuals with unilateral transfemoral amputation.
2025
Rate of Force Development during the Sit-to-Stand Task in Individuals with Transfemoral Amputation: Daily Use vs. Motorized Knee Prostheses
The American Orthotic & Prosthetic Association (AOPA) National Assembly | Sept 3-6, 2025
Mizuno Y, Kaneishi D, Komuta M, Sun X, Hobara H
2025
Compares how quickly force is generated during sit-to-stand tasks when using a daily-use prosthesis and a motorized knee prosthesis.
2025
Enhanced Force Production in Sit-to-Stand Task: The Advantage of Motorized Knee Prosthesis in Individuals with Unilateral Transfemoral Amputation
The American Orthotic & Prosthetic Association (AOPA) National Assembly | Sept 3-6, 2025
Hobara H, Mizuno Y, Kaneishi D, Komuta M, Sun X
2025
Examines whether motorized knee assistance can improve force production during the sit-to-stand movement.
2025
Comparative Analysis of Weight-Bearing Ratios During Standing in Individuals with Transfemoral Amputation: Daily Use vs. Motorized Knee Prosthesis
American Academy of Orthotists & Prosthetists (AAOP) 51st Annual Meeting & Scientific Symposium | Feb 26-Mar 1, 2025
Morishima R, Hara T, Kaneishi D, Komuta M, Sun X, Hobara H
2025
Compares standing weight distribution when participants use their daily-use prosthesis and a motorized knee prosthesis.
2025
Immediate Effect of Wearing a Motorized Knee Prosthesis on Kinetic Asymmetry During Gait
American Academy of Orthotists & Prosthetists (AAOP) 51st Annual Meeting & Scientific Symposium | Feb 26-Mar 1, 2025
Hobara H, Hara T, Morishima R, Kaneishi D, Komuta M, Sun X
2025
Evaluates the immediate effect of a motorized knee prosthesis on kinetic asymmetry during walking.
2024
Loading Rate Across a Range of Walking Speeds in Individuals with Transfemoral Amputation Using Mechanical and Microprocessor-Controlled Knees
American Academy of Orthotists & Prosthetists (AAOP) 50th Annual Meeting & Scientific Symposium | Mar 8, 2024
Hobara H, Hisano G, Ichimura D, Kaneishi D, Komuta M, Sun X, Tada M
2024
Examines intact-limb loading rates across multiple walking speeds and compares mechanical knees with microprocessor-controlled knees.
2024
Initial Investigation on Portable Measurement Systems for Ground Reaction Forces Utilizing Powered Prosthetic Knees
American Academy of Orthotists & Prosthetists (AAOP) 50th Annual Meeting & Scientific Symposium | Mar 8, 2024
Kaneishi D, Hobara H, Hisano G, Ichimura D, Komuta M, Sun X, Tada M
2024
Evaluates whether force sensors built into a powered prosthetic knee can measure ground reaction forces outside traditional labs.
2024
Improved Loading Asymmetry During Sit-to-Stand Movement in Unilateral Transfemoral Amputees Using Powered-Prosthetic Knees
American Academy of Orthotists & Prosthetists (AAOP) 50th Annual Meeting & Scientific Symposium | Mar 7, 2024
Hobara H, Hisano G, Kaneishi D, Komuta M, Balkman G, Sun X
2024
Examines whether powered prosthetic knee assistance can improve loading symmetry during the sit-to-stand movement.
Research presented to the O&P community.
SCIENTIFIC PRESENTATIONS
Academic Presentations and Publications
