Validity and Reliability Testing of the Scoliometer

• Published in: Physical therapy Vol. 70; no. 2; pp. 108 - 117
• Main Authors: Amendt, L E, Ause-Ellias, K L, Eybers, J L, Wadsworth, C T, Nielsen, D H, Weinstein, S L
• Format: Journal Article
• Language: English
• Published: United States American Physical Therapy Association 01.02.1990; Oxford University Press
• Subjects: Abnormalities; Adolescent; Adult; Child; Diagnosis; Equipment Design; Female; Humans; Male; Mass Screening - instrumentation; Measurement; Physical Therapy Modalities - instrumentation; Predictive Value of Tests; Reproducibility of Results; Scoliosis; Scoliosis - diagnosis; Spine
• ISSN: 0031-9023; 1538-6724
• DOI: 10.1093/ptj/70.2.108

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). Correlation 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.