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The Journal of Bone and Joint Surgery 83:42 (2001)
© 2001 The Journal of Bone and Joint Surgery, Inc.

Measurement Accuracy in Congenital Scoliosis

Fernando A.M. Facanha-Filho, MD, Robert B. Winter, MD, John E. Lonstein, MD, Steven Koop, MD, Thomas Novacheck, MD, E. A. L’Heureux, JrMD and Cheryl A. Noren, ART

Investigation performed at Twin Cities Spine Center, Minneapolis, Minnesota
Fernando A.M. Facanha-Filho, MD Av. Da Universidade 1940, Fortaleza Ceara, Brazil 60020
Robert B. Winter, MD John E. Lonstein, MD Cheryl A. Noren, ART Twin Cities Spine Center, 913 East 26th Street, Suite 600, Minneapolis, MN 55404
Steven Koop, MD Thomas Novacheck, MD Gillette Children’s Specialty Healthcare, 200 East University Avenue, St. Paul, MN 55101
E.A. L’Heureux Jr, MD Spine Center at Renaissance, 1701 Renaissance Boulevard, Suite 101, Edmond, OK 73013-3022
No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.

Background:

The accuracy of measurement of curves in idiopathic scoliosis has been extensively studied; however, we know of only one article in the literature concerning the accuracy of measurement of curves in congenital scoliosis. That article stated that intraobserver variability was ± 9.6° and interobserver variability was ± 11.8°.

Methods:

Sixty-nine curves in fifty patients with congenital scoliosis were measured on two separate occasions by seven different observers with varying experience in curve measurement.

Results:

Mean intraobserver variance ranged from 1.9° to 5.0°, with an average of 2.8° (95% confidence limit, ± 3°) for the seven observers. The interobserver variance was 3.35° (95% confidence limit, 7.86°).

Conclusions:

It is possible to measure curves in congenital scoliosis with much greater accuracy than previously reported. In the clinical situation in which a skilled observer can measure two radiographs at the same time, an accuracy of ± 3° can be expected 95% of the time.


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