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Validity and Reliability Testing of the Scoliometer®

L Amendt, MPT, is Staff Physical Therapist, Providence Hospital, 3200 Providence Dr, Anchorage, AK 99508.
K Ause-Ellias, MPT, is Staff Physical Therapist, Cook County Hospital, 1835 W Harrison, Chicago, IL 60612.
J Eybers, MPT, is Staff Physical Therapist, St Luke's Regional Medical Center, Sioux City, IO 51104.
C Wadsworth, MS, PT, is Lecturer, Physical Therapy Program, The University of Iowa, Iowa City, IA.
D Nielsen, PhD, PT, is Associate Professor, Physical Therapy Program, The University of Iowa.
S Weinstein, MD, is Professor of Orthopedic Surgery, The University of Iowa.
Ms Amendt, Ms Ause-Ellias, and Ms Eybers were students in the Master of Physical Therapy Program, College of Medicine, The University of lowa, when this study was completed in partial fulfillment of the requirements for their master's degree

This study was designed to evaluate the Scoliometer®, an instrument that measures axial trunk rotation in individuals with scoliosis. The objectives included determining 1) the Scoliometer's® screening capability and validity and 2) the intrarater and interrater reliability of Scoliometer® measurements. Scoliometer® measurements made by two raters on 65 persons with idiopathic scoliosis were correlated with radiographic assessment of vertebral (pedicle) rotation and lateral curvature (Cobb method). Correlations ranged from .32 to .46 with pedicle rotation and from .46 to .54 with the Cobb angle. Frequency analysis revealed relatively good specificity, sensitivity, and predictive capability of the Scoliometer®. Intrarater and interrater reliability coefficients were high (r = .86–.97). These results indicate good measurement reproducibility. The less-than-optimal between-method correlation coefficients suggest that the validity of Scoliometer® measurements is not sufficient to use this method alone for determining patient diagnosis and management. Based on the positive-frequency analysis, however, the use of this tool as a screening device would be appropriate.

Key Words: Neck and trunk, scoliosis • Scoliosis • Spinal curvatures • Tests and measurements, functional

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