Foot placement coordination is impaired in people with Parkinson's disease.
Charlotte Lang, Jeffrey M Hausdorff, Sjoerd M Bruijn and 7 others
PMID 41353391WHAT IT FOUND
People with Parkinson's disease place their feet less precisely than healthy adults, with errors of 3 to 4 mm.
This loss of fine control occurs even when walking speed is normal, suggesting a specific deficit in how the body coordinates steps to maintain balance.
Key findings
01Individuals with Parkinson's disease showed significantly higher foot placement errors than healthy controls in both side-to-side and forward-backward directions, with effect sizes ranging from 0.41 to 1.04.
02The absolute difference in foot placement error was approximately 3 to 4 mm, which is substantial relative to the typical 8 to 15 mm range of foot placement precision.
03Side-to-side foot placement appeared more tightly coupled to body motion in the Parkinson's group, but this may reflect increased movement variability rather than improved control.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study included only individuals with mild Parkinson's disease who could walk independently at a speed similar to healthy controls, so the findings may not apply to those with more advanced disease or slower gait. The analysis was limited to straight-line walking; foot placement control may differ significantly during turning or when navigating obstacles. The higher correlation between body motion and foot placement in the Parkinson's group could be due to increased variability rather than superior control, making the interpretation of this specific metric uncertain. The study used a single marker to estimate the center of mass, which is an approximation and may not capture subtle shifts in body weight distribution.
Declared interests
The study was funded by the Swiss Federal Institute of Technology Zurich.
The easy way to misread this
Do not interpret the higher statistical correlation between body motion and foot placement in the Parkinson's group as evidence of better balance control. The authors explicitly state this may be caused by increased movement variability, and the primary finding remains that foot placement is less precise.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →