Related Experiment Video
Updated: Jul 9, 2026
08:40
Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
Published on: June 12, 2019
Evidence of abnormal lower-limb torque coupling after stroke: an isometric study
Theresa Hayes Cruz1, Yasin Y Dhaher
1Department of Biomedical Engineering, Northwestern University, Chicago, IL, USA.
Stroke
|December 8, 2007
Summary
Stroke survivors exhibit abnormal hip torque patterns and unique hip-knee coupling, impacting gait. These neuromechanical changes, not just muscle weakness, are crucial for understanding and treating post-stroke movement abnormalities.
Area of Science:
- Neuromechanics
- Biomechanics
- Neurorehabilitation
Background:
- Stroke survivors often exhibit abnormal joint torque patterns affecting gait.
- Lower limb torque-coupling studies are scarce despite their relevance to gait abnormalities.
Purpose of the Study:
- To investigate isometric hip torque production and coupling in stroke survivors.
- To compare torque patterns between stroke survivors and healthy controls during gait-related postures.
Main Methods:
- Twenty-two chronic stroke subjects and 11 controls performed isometric hip torque tasks.
- Torques were measured in sagittal and frontal planes in gait-like postures.
- Involuntary knee torques were recorded simultaneously.
Main Results:
- Stroke group showed abnormal hip torque bias towards extension and adduction.
- Stroke group exhibited reduced torques in flexion and abduction/flexion.
- Abnormal coupling of knee extension with hip adduction was observed in the stroke group.
Conclusions:
- Neuromechanical changes, including abnormal hip-knee torque coupling, significantly influence post-stroke gait abnormalities.
- Direction-specific hip torque weakness and abnormal coupling are key findings.
- Understanding these neuromechanical factors can inform stroke rehabilitation strategies.
