A new paradigm for assessing postural stability.
Talah Wafa, Christopher Zalewski, Chizuko Tamaki and 3 others
PMID 36571908WHAT IT FOUND
Healthy adults lean significantly less than the standard limit used to score balance tests.
Because the test assumes everyone can lean 12.5 degrees, it may overestimate stability and miss fall risk in patients who actually have a smaller range of motion.
Key findings
01The average personal limit of stability in healthy adults was 9.366 degrees, significantly lower than the theoretical 12.5 degrees used in standard scoring.
02Using the standard 12.5-degree limit inflates equilibrium scores, potentially underestimating fall risk for patients with a smaller actual range of stability.
03Men had a significantly larger personal limit of stability than women, though age did not significantly affect this measure in the healthy cohort.
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 study only included healthy adults with strict eligibility criteria (normal vision, hearing, cognition, and mobility). It does not include patients with balance disorders, who are the primary users of this test. The finding that the standard limit is too high is based on healthy controls. It has not yet been validated in a population with known fall risks or vestibular pathologies. The study did not test whether using the personal LOS actually improves fall prediction accuracy, only that it changes the calculated scores.
Declared interests
The authors declare no financial or non-financial interests. The study was supported by NIH intramural funding.
The easy way to misread this
Do not assume this study proves that the new 'personal LOS' method accurately predicts falls. It only shows that the current standard method likely overestimates stability in healthy people. The authors explicitly state this modified method must still be verified in patients with balance disorders before it can be used for clinical diagnosis or risk stratification.