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Reliability and validity of a novel Isokinetic Knee Dynamometer System
Bryan L Riemann1, Matthew D Watson1, George J Davies1
1Biodynamics and Human Performance Center, Georgia Southern University-Armstrong Campus, Savannah, USA.
Acta of Bioengineering and Biomechanics
|June 21, 2023
Summary
A new Isokinetic Knee Dynamometer demonstrates excellent reliability and validity for assessing knee extension and flexion peak moments. This system offers comparable performance to the Biodex System 4, potentially increasing clinical use.
Area of Science:
- Biomechanics
- Kinesiology
- Rehabilitation Engineering
Background:
- Isokinetic dynamometry is crucial for assessing knee joint function.
- Existing systems can be complex and costly.
- A novel prototype aims to provide a more accessible alternative.
Purpose of the Study:
- To evaluate the intersession reliability and validity of a new Isokinetic Knee Dynamometer.
- To compare its performance against the established Biodex System 4.
- To assess peak moments during knee extension and flexion.
Main Methods:
- Thirty-five healthy participants underwent two testing sessions.
- Bilateral concentric isokinetic knee movements were tested at 60, 180, and 240 °/s.
- Peak moments were analyzed for reliability and agreement between devices.
Main Results:
- The new dynamometer exhibited excellent relative reliability, similar to the Biodex System 4.
- Both systems showed acceptable absolute reliability.
- Good to excellent relative agreement was found between the two dynamometers across various conditions.
Conclusions:
- The Isokinetic Knee Dynamometer is a reliable and valid tool for isokinetic knee assessments.
- Its simpler design and lower cost may enhance clinical adoption.
- Measurement properties are acceptable for both dominant and non-dominant limbs at high velocities.
