Intraexaminer and interexaminer reliability of pressure biofeedback unit for assessing lumbopelvic stability during 6 lower limb movement tests

Objective The purpose of this study was to assess examiners' intrarater and interrater reliability to use a pressure biofeedback unit (PBU) during 6 lower limb movement tests based on Movement System Impairment classification model for low back pain (LBP) in people with nonspecific LBP. Methods Thirty subjects (13 men and 17 women) with chronic nonspecific LPB were assessed during 6 lower limb movement tests based on Movement System Impairment classification using a PBU. Each test was performed twice by 2 assessors with a 48-hour interval between test sessions. Reliability indices of PBU measures (intraclass correlation coefficient [ICC]) were calculated. Results Intrarater reliability for hip and knee movement tests was good to excellent (ICC^3,3, 0-.60-0.95). Interrater reliability for hip and knee movement tests was fair to excellent (ICC^2,3, 0.40-0.86). Standard error of the measurement and smallest detectable change for the movement tests ranged from 1.4 to 11.3 mm Hg and from 3.9 to 31.3 mm Hg, respectively. Conclusions The results of this study indicate that trained examiners can reliably perform PBU measures for patients with chronic LBP.