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Benjamin J. Fregly
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Journal Articles

Muscle Synergies Modify Optimization Estimates of Joint Stiffness During Walking

Mohammad S. Shourijeh, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. January 2020, 142(1): 011011.
Paper No: BIO-19-1133
https://doi.org/10.1115/1.4044310
Published Online: October 1, 2019
View Article titled, Muscle Synergies Modify Optimization Estimates of Joint Stiffness During Walking
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Topics: Muscle, Optimization, Stiffness, Musculoskeletal system
Journal Articles

Can Measured Synergy Excitations Accurately Construct Unmeasured Muscle Excitations?

Nicholas A. Bianco, Carolynn Patten, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. January 2018, 140(1): 011011.
Paper No: BIO-15-1381
https://doi.org/10.1115/1.4038199
Published Online: November 15, 2017
View Article titled, Can Measured Synergy Excitations Accurately Construct Unmeasured Muscle Excitations?
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Topics: Excitation, Muscle, Electromyography, Signals
Journal Articles

Development of a Subject-Specific Foot-Ground Contact Model for Walking

Jennifer N. Jackson, Chris J. Hass, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. September 2016, 138(9): 091002.
Paper No: BIO-15-1454
https://doi.org/10.1115/1.4034060
Published Online: July 28, 2016
View Article titled, Development of a Subject-Specific Foot-Ground Contact Model for Walking
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Topics: Calibration, Errors, Friction, Kinematics, Optimization, Springs, Stiffness, Damping, Design
Journal Articles

Neuromusculoskeletal Model Calibration Significantly Affects Predicted Knee Contact Forces for Walking

Gil Serrancolí, Allison L. Kinney, Benjamin J. Fregly, Josep M. Font-Llagunes
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. August 2016, 138(8): 081001.
Paper No: BIO-15-1258
https://doi.org/10.1115/1.4033673
Published Online: June 13, 2016
View Article titled, Neuromusculoskeletal Model Calibration Significantly Affects Predicted Knee Contact Forces for Walking
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Topics: Calibration, Knee, Muscle, Optimization, Fibers, Electromyography
Includes: Supplementary data
Journal Articles

Computational Prediction of Muscle Moments During ARED Squat Exercise on the International Space Station

Benjamin J. Fregly, Christopher D. Fregly, Brandon T. Kim
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. December 2015, 137(12): 121005.
Paper No: BIO-15-1230
https://doi.org/10.1115/1.4031795
Published Online: October 30, 2015
View Article titled, Computational Prediction of Muscle Moments During ARED Squat Exercise on the International Space Station
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Topics: Astronauts, Muscle, Simulation, Knee, NASA
Journal Articles

Residual Elimination Algorithm Enhancements to Improve Foot Motion Tracking During Forward Dynamic Simulations of Gait

Jennifer N. Jackson, Chris J. Hass, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. November 2015, 137(11): 111002.
Paper No: BIO-15-1028
https://doi.org/10.1115/1.4031418
Published Online: September 16, 2015
View Article titled, Residual Elimination Algorithm Enhancements to Improve Foot Motion Tracking During Forward Dynamic Simulations of Gait
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Topics: Algorithms, Errors, Feedback, Simulation, Kinematics, Calibration, Design, Optimization, Stress
Proceedings Papers

Effective Gait Modification Strategies for Offloading the Medial Compartment of the Knee

Benjamin J. Fregly, Darryl D. D’Lima, Clifford W. Colwell, Jr.
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 765-766, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-192701
https://doi.org/10.1115/SBC2008-192701
View Paper titled, Effective Gait Modification Strategies for Offloading the Medial Compartment of the Knee
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Topics: Knee, Diseases, Knee joint prostheses, Osteoarthritis, Torque, Wedges
Proceedings Papers

Dynamic Simulation of Knee Motion Using Three-Dimensional Surrogate Contact Modeling

Yi-Chung Lin, Raphael T. Haftka, Nestor V. Queipo, Benjamin J. Fregly
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 177-178, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-190966
https://doi.org/10.1115/SBC2008-190966
View Paper titled, Dynamic Simulation of Knee Motion Using Three-Dimensional Surrogate Contact Modeling
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Topics: Contact modeling, Knee, Simulation, Computers, Cycles, Design, Optimization
Proceedings Papers

Prediction of Internal Contact Forces at the Knee From External Measurements

Jonathan P. Walter, Scott A. Banks, Darryl D. D’Lima, Benjamin J. Fregly
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 685-686, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-193169
https://doi.org/10.1115/SBC2008-193169
View Paper titled, Prediction of Internal Contact Forces at the Knee From External Measurements
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Topics: Knee, Diseases, Stress, Cartilage, Damage, Kinematics, Knee joint prostheses, Osteoarthritis, Risk
Proceedings Papers

Simultaneous Determination of Skeletal Model Parameter Values, Motions, and Controls From Noisy Measurement Data

Michael G. Fattey, Benjamin J. Fregly
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 689-690, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-193175
https://doi.org/10.1115/SBC2008-193175
View Paper titled, Simultaneous Determination of Skeletal Model Parameter Values, Motions, and Controls From Noisy Measurement Data
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Topics: Biomechanics, Dynamics (Mechanics), Gait analysis, Optimization, Parameter estimation, Stress
Proceedings Papers

Evaluation of Predicted Knee Joint Muscle Forces During Gait Using an Instrumented Knee Implant

Justin W. Fernandez, Hyung J. Kim, Massoud Akbarshahi, Jonathan P. Walter, Benjamin J. Fregly, Marcus G. Pandy
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 847-848, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-191839
https://doi.org/10.1115/SBC2008-191839
View Paper titled, Evaluation of Predicted Knee Joint Muscle Forces During Gait Using an Instrumented Knee Implant
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Topics: Knee, Knee joint prostheses, Muscle, Biomechanics, Hip joint prostheses, Kinematics, Musculoskeletal system
Journal Articles

Muscle Synergies May Improve Optimization Prediction of Knee Contact Forces During Walking

Jonathan P. Walter, Allison L. Kinney, Scott A. Banks, Darryl D. D'Lima, Thor F. Besier, David G. Lloyd, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. February 2014, 136(2): 021031.
Paper No: BIO-13-1427
https://doi.org/10.1115/1.4026428
Published Online: February 5, 2014
View Article titled, Muscle Synergies May Improve Optimization Prediction of Knee Contact Forces During Walking
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Topics: Electromyography, Excitation, Knee, Muscle, Optimization, Stress, Shapes, Musculoskeletal system
Includes: Supplementary data
Proceedings Papers

Muscle Synergy Constraints Improve Prediction of Knee Contact Force During Gait

Benjamin J. Fregly, Jonathan P. Walter, Allison L. Kinney, Scott A. Banks, Darryl D. D’Lima, Thor F. Besier, David G. Lloyd
Proc. ASME. SBC2013, Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions, V01BT34A006, June 26–29, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SBC2013-14782
https://doi.org/10.1115/SBC2013-14782
View Paper titled, Muscle Synergy Constraints Improve Prediction of Knee Contact Force During Gait
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Topics: Knee, Muscle, Computer simulation, Computers, Degrees of freedom, Diseases, Force measurement, Mechanical admittance, Musculoskeletal system, Optimization
Proceedings Papers

Surrogate Knee Contact Modeling Using Artificial Neural Networks

Ilan Eskinazi, Benjamin J. Fregly
Proc. ASME. SBC2013, Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions, V01BT31A003, June 26–29, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SBC2013-14581
https://doi.org/10.1115/SBC2013-14581
View Paper titled, Surrogate Knee Contact Modeling Using Artificial Neural Networks
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Topics: Artificial neural networks, Bone, Contact modeling, Engineering simulation, Knee, Musculoskeletal soft tissue mechanics, Orthotics, Simulation, Stress
Proceedings Papers

Effects of Body Weight Modification on Internal Knee Contact Forces During Gait

Allison L. Kinney, Heather K. Vincent, Melinda K. Harman, James Coburn, Darryl D. D’Lima, Benjamin J. Fregly
Proc. ASME. SBC2013, Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments, V01AT20A028, June 26–29, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SBC2013-14727
https://doi.org/10.1115/SBC2013-14727
View Paper titled, Effects of Body Weight Modification on Internal Knee Contact Forces During Gait
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Topics: Knee, Weight (Mass), Dynamics (Mechanics), Knee joint prostheses, Osteoarthritis, Risk, Stress
Proceedings Papers

Dynamic Simulation of Muscle Loading During ARED Squat Exercise on the International Space Station

Christopher D. Fregly, Brandon T. Kim, John K. De Witt, Benjamin J. Fregly
Proc. ASME. SBC2013, Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments, V01AT20A031, June 26–29, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SBC2013-14792
https://doi.org/10.1115/SBC2013-14792
View Paper titled, Dynamic Simulation of Muscle Loading During ARED Squat Exercise on the International Space Station
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Topics: Muscle, Simulation, Space stations, Astronauts, Countermeasures, Cylinders, NASA, Space flight, Stress, Vacuum
Proceedings Papers

Muscle and Contact Contributions to Inverse Dynamic Knee Loads During Gait

Benjamin J. Fregly, Yi-Chung Lin, Jonathan P. Walter, Marcus G. Pandy, Scott A. Banks, Darryl D. D’Lima
Proc. ASME. SBC2009, ASME 2009 Summer Bioengineering Conference, Parts A and B, 245-246, June 17–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: SBC2009-206558
https://doi.org/10.1115/SBC2009-206558
View Paper titled, Muscle and Contact Contributions to Inverse Dynamic Knee Loads During Gait
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Topics: Knee, Muscle, Stress, Arthroplasty, Cartilage, Computers, Degrees of freedom, Design, Musculoskeletal system, Redundancy (Engineering)
Proceedings Papers

Real-Time Model-Based Gait Retraining for Knee Osteoarthritis Rehabilitation

Jonathan P. Walter, Hugh Pun, Terese L. Chmielewski, Newton Chan, Benjamin J. Fregly
Proc. ASME. SBC2009, ASME 2009 Summer Bioengineering Conference, Parts A and B, 1095-1096, June 17–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: SBC2009-206567
https://doi.org/10.1115/SBC2009-206567
View Paper titled, Real-Time Model-Based Gait Retraining for Knee Osteoarthritis Rehabilitation
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Topics: Knee, Osteoarthritis, Stress, Cartilage, Diseases, Cycles
Proceedings Papers

Simultaneous Prediction of Muscle and Contact Forces in the Knee During Gait

Benjamin J. Fregly, Yi-Chung Lin, Jonathan P. Walter, Justin W. Fernandez, Scott A. Banks, Marcus G. Pandy
Proc. ASME. SBC2009, ASME 2009 Summer Bioengineering Conference, Parts A and B, 251-252, June 17–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: SBC2009-205543
https://doi.org/10.1115/SBC2009-205543
View Paper titled, Simultaneous Prediction of Muscle and Contact Forces in the Knee During Gait
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Topics: Knee, Muscle, Nervous system, Bone, Design, Osteoarthritis, Osteoporosis, Patient rehabilitation, Performance, Structural mechanics
Proceedings Papers

Decreased Knee Adduction Moment Does Not Guarantee Decreased Medial Contact Force During Gait

Jonathan P. Walter, Darryl D. D’Lima, Clifford W. Colwell, Jr., Benjamin J. Fregly
Proc. ASME. SBC2009, ASME 2009 Summer Bioengineering Conference, Parts A and B, 261-262, June 17–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: SBC2009-206706
https://doi.org/10.1115/SBC2009-206706
View Paper titled, Decreased Knee Adduction Moment Does Not Guarantee Decreased Medial Contact Force During Gait
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Topics: Knee, Anterior cruciate ligament, Diseases, Osteoarthritis, Stress, Wounds