Handheld dynamometer reliability to measure knee extension strength in rehabilitation patients-A cross-sectional study

João Pinto-Ramos, Tiago Moreira, Frederico Costa, Helena Tavares, João Cabral, Cristina Costa-Santos, Joana Barroso, Bernardo Sousa-Pinto, João Pinto-Ramos, Tiago Moreira, Frederico Costa, Helena Tavares, João Cabral, Cristina Costa-Santos, Joana Barroso, Bernardo Sousa-Pinto

Abstract

Introduction: The Handheld Dynamometer (HHD) has the potential to overcome some of the logistic and economic limitations of isokinetic dynamometers for measuring knee extension muscle strength. However, its reliability has not been fully assessed. The purpose of this study is to measure intra and inter-rater reliability of HHD for knee extension strength in patients receiving rehabilitation treatment, as well as to understand in which conditions is the reliability higher.

Methods: Twenty-nine patients admitted in an inpatient Physical Medicine and Rehabilitation unit were consecutively included in this cross-sectional study. Two experienced and two inexperienced physicians made two assessments of knee extension strength with HHD, separated by three hours. Intraclass Correlation Coefficients (ICC), absolute differences between assessments, and correlations between strength and functional variables were calculated.

Results: Intra and inter-rater ICC were overall high (≥ 0.950 and 0.927, respectively). Higher values were found when average of two measurements were made for estimating intra-rater ICC (ICC = 0.978; 95%CI = 0.969-0.985) but not for inter-rater ICC. ICC were not statistically significantly different when calculated based on measurements performed by inexperienced physicians and experienced ones. There was a moderate correlation between strength and functional variables.

Conclusion: Handheld Dynamometer seems to be a reliable option to measure knee extension muscle strength, particularly when two measurements are performed and their average is reported.

Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1. Schematic representation of the measurements…
Fig 1. Schematic representation of the measurements performed by each observer in each participant.
Fig 2. Standardized evaluation method of the…
Fig 2. Standardized evaluation method of the patients.
Observer was squatting with back against the wall and stretch arms in order to increase stability.

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