Acute Impact of Lower Body Positive Pressure Treadmill Walking in Individuals With Knee Osteoarthritis: A Pilot Study.
Prakash Jayabalan, Chad Hanaoka, Sanchita Sen and 3 others
PMID 40198783WHAT IT FOUND
Walking with 50% body weight support prevented the knee pain increase seen at full weight, while maintaining the same amount of moderate exercise.
This suggests off-loading allows people with knee osteoarthritis to walk longer without symptom flare-ups.
Key findings
01Full body weight walking caused significant increases in knee pain at 15, 30, and 45 minutes, whereas 50% body weight support did not cause pain increases at any time point.
02There was no significant difference in the duration of moderate-intensity exercise performed between the two walking conditions, meaning off-loading did not reduce the cardiovascular benefit.
03Serum biomarkers associated with cartilage stress (COMP and CTX-II) increased significantly after full body weight walking but not after 50% body weight support.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Participants were selected because they could already walk for 45 minutes, so the results may not apply to patients with more severe functional limitations. The study was a pilot with a small sample size (n=32) and short-term outcomes (acute response only), so it cannot determine long-term benefits or disease modification. Biomarkers were measured in blood, not synovial fluid, and may reflect activity in other joints despite exclusion criteria for other symptoms. The study tested only two levels of support (100% and 50%) and did not identify the minimum amount of off-loading needed to prevent pain. Gait changes such as wider base of support were observed, and their clinical significance for fall risk or long-term mechanics is unknown.
Declared interests
All authors declared no conflicts of interest.
The easy way to misread this
Do not assume this proves that off-loaded walking reduces cartilage damage long-term. The biomarker changes were acute, and the study was too small and short to determine if this prevents disease progression or improves function over months.
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 →