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Reliability of Using a Handheld Tablet and Application to Measure Lower-Extremity Alignment Angles
Deborah L King1, Barbara C Belyea
1Dept. of Physical Therapy, Ithaca College, Ithaca, NY.
Journal of Sport Rehabilitation
|October 14, 2014
Summary
A tablet app reliably measures lower-extremity kinematics during jump landings, aiding in identifying knee injury risk. Experienced raters and multiple trials improve accuracy for clinical use.
Area of Science:
- Biomechanics
- Sports Medicine
- Clinical Assessment
Background:
- Landing kinematics are crucial risk factors for knee injuries.
- Detecting atypical movement patterns is vital for injury prevention in clinical settings.
Purpose of the Study:
- To evaluate the reliability of a handheld tablet and application for measuring lower-extremity kinematics during drop vertical-jump landings.
- To assess the feasibility of using this technology in clinical settings for injury risk identification.
Main Methods:
- 23 healthy adults performed drop vertical jumps.
- An iPad 2 with a KinesioCapture app recorded jump landings.
- Measurements included frontal-plane angles, knee, and hip flexion.
- Intertrial and interrater reliability were assessed using ICC and SEM.
Main Results:
- Good to excellent intertrial reliability was observed (ICC .71-.99).
- Interrater reliability varied from fair to excellent (ICC .39-.98), particularly with experienced raters.
- Smaller SEM values indicated higher precision with experienced raters.
Conclusions:
- A tablet and app system shows promise for assessing landing kinematics and identifying knee injury risk.
- Intertrial reliability is strong with averaged measures.
- Interrater reliability is dependent on rater experience; using multiple trials by a single rater is recommended.
