A Simple Novel System for the Assessment of Balance

Impairments in balance control are common across various clinical conditions and with aging, necessitating reliable methods for assessment. This study introduces a novel, low-cost posturographic system based on an unstable spring-supported platform that calculates center of pressure (COP) displacement using angular measurements in two horizontal axes. A heterogeneous sample of 105 participants underwent repeated trials on both the novel system and a traditional firm platform under eyes-open and eyes-closed conditions. COP velocity was recorded and analyzed for reliability using intraclass correlation coefficients (ICCs). The results showed significantly higher COP velocity on the unstable platform when visual input was removed, indicating greater reliance on visual control under unstable conditions. The novel system demonstrated comparable reliability to traditional platforms, with ICC values exceeding 0.90 when mean values from three trials were used. No learning effect was observed on the unstable platform, unlike the firm one. These findings suggest that the new system is a valid alternative for balance assessment, which is particularly effective in differentiating individuals with varying balance capabilities under eyes-closed conditions. Its affordability and methodological soundness make it suitable for clinical use and broader screening applications aimed at fall prevention.