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Reproducibility of Rasterstereography for Kyphotic and Lordotic Angles, Trunk Length, and Trunk Inclination: A Reliability Study

Melvin, Mohokum, MSc*; Sylvia, Mendoza, MSc*; Udo, Wolf, MSc*; Helmut, Sitter, PhD; Paletta, Jürgen R., PhD; Adrian, Skwara, MD

Erratum

In the article that appeared on page 1353 in the June 15, 2010 issue of Spine , 1 the authors' names were listed incorrectly. The authors' names should appear as:

Melvin Mohokum, Sylvia Mendoza, Wolf Udo, Helmut Sitter, Jürgen R. Paletta, and Adrian Skwara

Spine. 35(18):1738, August 15, 2010.

doi: 10.1097/BRS.0b013e3181cbc157
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Erratum

Study Design. Determination of reliability with 3 investigators using a collective of healthy volunteers.

Objective. To determine the reliability of rasterstereography 3-dimensional back surface analysis and reconstruction of the spine in healthy test subjects.

Summary of Background Data. Rasterstereography has been in clinical use since 1989 for patients with scoliosis and other spinal deformities and it significantly reduces the need for otherwise indispensable radiographs. The validity of this device has previously been examined in other studies. This study was performed to evaluate the reliability of rasterstereography for clinical application in diagnostic and follow-up examinations.

Methods. Fifty-one healthy volunteers were examined rasterstereographically by 3 investigators. Each investigator made a series of 3 measurements of each participant in which 8 spine parameters including kyphotic angle ICT-ITL (max.), kyphotic angle VP-ITL, kyphotic angle VP-T12, lordotic angle ITL-ILS (max.), lordotic angle ITL-DM, lordotic angle T12-DM, trunk length VP-DM and trunk inclination were measured. Cronbach α was calculated. The influence of high or low body mass index on the accuracy of the technique was evaluated as well.

Results. Cronbach α for the intratester-reliability of the kyphotic angle ICT-ITL (max.) for the 3 investigators has values between 0.921 and 0.992. The intertester-reliability for the same parameter is 0.979 (95% CI). In this study group a meaningful association between body mass index and reliability of the device was not found.

Conclusion. The reliability revealed very good results, both for intratester and for intertester reliability. The technique is well suited for analysis of the back in standing position. The body mass index has no influence on the reproducibility.

Rasterstereography has been in clinical use since 1989 for patients with scoliosis and other spinal deformities and it significantly reduces the need for otherwise indispensable radiographs. In this study the reliability of rasterstereography on three-dimensional back surface analysis and reconstruction of the spine in healthy test subjects was evaluated.

From the *Department of Physical Therapy; †Institute of Theoretical Surgery; and ‡Department of Orthopaedics and Rheumatology, University Hospital Marburg, Germany.

Acknowledgment date: April 17, 2009. First revision date: July 11, 2009. Second revision date: August 27, 2009. Acceptance date: August 31, 2009.

The manuscript submitted does not contain information about medical device(s)/drug(s).

No funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.

The code of approval of the local ethics committee is Ethik-Kommission des Fachbereichs Medizin der Philipps-Universität Marburg, Reg. Nr: 84/08.

Address correspondence and reprint requests to Adrian Skwara, MD, Department of Orthopaedics and Rheumatology, University Hospital Marburg, Baldingerstrasse, D-35041 Marburg, Germany; E-mail: skwara@med.uni-marburg.de

© 2010 Lippincott Williams & Wilkins, Inc.