The validity of a portable clinical force plate in assessment of static postural control: concurrent validity study

Thirty-one healthy adults were recruited. Participants completed 1 set of 5 trials on each force plate. Postural control measures (centre of pressure [COP] average velocity and sway area) were collected and compared using the Midot Posture Scale Analyzer (clinical force plate) and the Accugait force plate (criterion measure). Intra class correlation coefficient (ICC), standard error of measurement , and paired t-tests were calculated and Bland-Altman plots were constructed to compare the force plates and assess consistency of measurement and agreement between them.The ICC values (ICC？=？0.14-0.60) between the two force plates were lower than the acceptable value for both COP average velocity and sway area. There was significant difference (p？>？0.05) in COP average velocity and sway area between the force plates. Examination of the plots revealed that there is less difference between the force plates in lower magnitudes of COP for average velocity and sway area however, the greater the average velocity and sway area, the greater the difference between the measures obtained from the two force plates.Findings of this study showed poor concurrent validity of the clinical force plate. This clinical force plate cannot be a replacement for known reliable and valid force plates and consequently measures obtained from this force plate should be treated with caution especially in a clinical population.Postural control is a crucial factor in maintaining balance during standing, walking, task performance and when responding to the unexpected perturbations experienced in everyday life [1]. Postural control assessment can provide useful information when identifying individuals who are susceptible to postural control deficits [2,3]. Furthermore, postural control assessment has been used in sports medicine for selection of talented athletes, identification of athletes at high risk for injury, and for the prevention of sports related injuries [4]. Postural control is usually assessed