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Smartphone-Based Goniometry Accuracy in Clinical Scenarios.
Bradford S Waddell1, Neil L Duplantier2, Qingyang Luo2
1Hospital for Special Surgery, New York, New York. Address correspondence to: Bradford S. Waddell, MD, 535 East 70th Street, New York, NY 10021;
Journal of Surgical Orthopaedic Advances
|February 21, 2018
Summary
iPhone goniometer apps offer moderate accuracy for hip and knee joint measurements, showing weak to moderate correlation compared to universal goniometers in clinical settings.
Area of Science:
- Orthopaedic Surgery
- Medical Device Technology
- Biomedical Engineering
Background:
- Accurate joint angle measurement is crucial in orthopaedic assessments.
- Traditional universal goniometers are the gold standard but can be cumbersome.
- Smartphone applications offer a potentially portable and accessible alternative for goniometry.
Purpose of the Study:
- To compare the accuracy of two iPhone-based goniometer applications against a universal goniometer.
- To evaluate the reliability of smartphone goniometers for hip and knee joint measurements in a clinical context.
Main Methods:
- Three physicians performed 35 joint angle measurements for hip and knee.
- Measurements were taken using a universal goniometer, DrGoniometer (iPhone), and SimpleGoniometer (iPhone).
- Data were analyzed using Pearson correlation coefficients to assess agreement.
Main Results:
- Smartphone goniometers demonstrated moderate agreement with the universal goniometer for both knee (r > .322) and hip (r > .168) measurements.
- Average knee angles: Universal (83.46°), DrGoniometer (85.23°), SimpleGoniometer (80.39°).
- Average hip angles: Universal (62.34°), DrGoniometer (60.87°), SimpleGoniometer (59.34°).
Conclusions:
- iPhone-based goniometer applications provide accurate, though weakly to moderately correlated, measurements for hip and knee joints.
- These smartphone tools show potential as supplementary or alternative goniometers in orthopaedic practice.
- Further research may explore their utility in diverse clinical scenarios and patient populations.
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