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Measuring the Cobb angle with the iPhone in kyphoses: a reliability study.

Frederic Jacquot¹, Axelle Charpentier, Sofiane Khelifi

¹Orthopedics, Hôpital Saint Antoine, Paris, France. frederic.jacquot@sat.aphp.fr

International Orthopaedics

|June 2, 2012

Summary

An iPhone application reliably measures kyphotic angles, showing excellent correlation with the standard protractor method. This smartphone tool offers a valid and reproducible alternative for assessing spinal deformities.

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Area of Science:

Orthopedics
Medical Imaging
Digital Health

Background:

Smartphones are increasingly utilized in healthcare for diverse applications.
Measuring spinal deformity angles is crucial for diagnosis and treatment planning.

Purpose of the Study:

To develop and assess the reliability of an iPhone application for measuring kyphotic angles.
To compare the accuracy of the iPhone application against the traditional protractor method.

Main Methods:

Radiographs from 20 patients were measured by six operators at two separate times.
Measurements were taken using both a protractor and the developed iPhone application (CobbMeter).
Intraclass correlation coefficients (ICCs) were calculated to assess inter- and intraobserver reliability and method agreement.

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Main Results:

Excellent correlation (ICC=0.963) was found between the iPhone application and the protractor method.
High intraobserver (ICC=0.977) and interobserver (ICC=0.965) reliability were demonstrated for the iPhone application.
The iPhone application showed slightly higher, though not statistically significant, reliability compared to the protractor.

Conclusions:

The iPhone application is a valid tool for measuring kyphotic angles.
This smartphone-based method is comparable in accuracy to the standard protractor technique.
The application offers a reliable and reproducible approach for assessing spinal deformities.