How persons with transtibial amputation regulate lateral stepping while walking in laterally destabilizing environments.
Jonathan B Dingwell, Joseph P Cusumano, Jonathan H Rylander and 1 others
PMID 33099136WHAT IT FOUND
Both able-bodied adults and those with transtibial amputation tightened their lateral stepping control when faced with visual or platform perturbations.
Amputees did not show impaired regulation, suggesting their balance deficits stem from biomechanics rather than a failure to adapt their stepping strategy.
Key findings
01When perturbed, both groups adjusted their stepping to more tightly regulate step width and lateral body position.
02Participants with transtibial amputation exhibited correction slopes and regulation strengths similar to able-bodied controls across all conditions.
03Amputees walked with wider steps and greater variability only when the platform itself moved, not during visual perturbations alone.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The sample size was very small (N=8 for amputees), which reduces the power to detect subtle differences between groups. Participants were young, active-duty military personnel, so findings may not apply to older adults or those with lower functional levels. The study took place in a controlled laboratory environment using a motion platform, which may not fully replicate the complexity of real-world outdoor terrain.
Declared interests
The authors declared no financial or personal conflicts of interest.
The easy way to misread this
Do not conclude that amputees have no balance deficits. The study found that while their *strategy* for regulating steps was intact, they still exhibited greater variability in lateral position during platform perturbations, indicating the deficit lies in execution or biomechanics, not control planning.