Intertester reliability for measuring pelvic tilt in standing.

The purpose of this study was to examine intertester reliability using a method of measuring the relaxed standing pelvic-tilt angle, active anterior and posterior pelvic-tilt angles and ranges of motion, and the total pelvic-tilt ROM in the sagittal plane. After an instructional session, 6 testers measured the pelvic-tilt angles of the right side of 12 subjects. Pelvic-tilt angles were calculated using trigonometric functions. Degrees of ROM were determined from the pelvic-tilt angles obtained. The intraclass correlation coefficient was .95 for standing pelvic-tilt angle, .93 for the anterior pelvic-tilt angle, .93 for the posterior pelvic-tilt angle, .88 for the anterior pelvic-tilt ROM, .93 for the posterior pelvic-tilt ROM, and .90 for the total pelvic-tilt ROM. We concluded that intertester reliability, using this method, was very high for measuring pelvic tilt in the sagittal plane.