Biomechanical control of paretic lower limb during imposed weight transfer in individuals post-stroke.

The perturbation challenged medial-lateral balance but did not directly target anterior-posterior balance control. Joint torque and muscle activation patterns were not measured, so the underlying neuromuscular causes of the observed kinematic deficits are inferred rather than proven. The study included a small sample size with a majority of participants having left-sided hemiparesis and being male, limiting generalizability. Foot position was not standardized, which may have influenced stance width and results. The task was a standing perturbation, so findings may not directly translate to continuous walking mechanics.

The study was supported by the National Institutes of Health. No other conflicts of interest were reported.

Do not assume these biomechanical deficits are the sole cause of fall risk or gait asymmetry. The study measured a specific standing perturbation task, not walking, and did not measure muscle activity or joint torque, so the exact neuromuscular mechanisms remain unproven.