Reliability of a novel in vivo optical strain assessment of carbon fiber custom dynamic orthoses.
Sara M Magdziarz, Ana V Figueroa, Jessica E Goetz and 1 others
PMID 41084102WHAT IT FOUND
A non-contact camera system reliably measured strain on carbon fiber ankle braces in healthy adults.
Strain was highest at the distal strut and increased with ankle dorsiflexion. Reliability was lower at the proximal strut, so clinicians should expect more measurement noise in that region.
Key findings
01Strain on the posterior strut of a carbon fiber ankle brace was approximately two-fold greater at the middle location and 3.5x greater at the distal location compared to the proximal location.
02Digital image correlation showed generally good reliability for measuring strain, with intraclass correlation coefficients ranging from 0.14 to 0.76 depending on location and ankle angle.
03Strain measurements were consistent across repeated tests, with no statistically significant differences between time points for any combination of location and ankle dorsiflexion angle.
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 was conducted only in healthy young adults without neurological or musculoskeletal conditions, so results may not apply to patients with spasticity, contractures, or different limb geometries. The method was tested only on one type of carbon fiber dynamic AFO, so it may not generalize to other materials or orthosis designs. Reliability was lower at the proximal strut location, meaning measurements taken there are less consistent. The study assessed reliability of the measurement technique, not the clinical effectiveness of the AFO or its impact on patient function.
Declared interests
The authors disclosed no potential conflicts of interest.
The easy way to misread this
Do not interpret this as evidence that the specific AFO tested improves patient function. The study only validates the reliability of a camera-based method for measuring material strain in healthy volunteers, not the clinical efficacy of the device.
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