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Reliability and validity of a novel device for quantifying ankle dorsiflexion force in persons with multiple
Michael J Asmussen1, Marita E Mauracher2, Onutobor Omu3
1Department of Biology, Mount Royal University, 4825 Mt Royal Gate SW, Calgary, AB, T3E6K6, Canada.
Background:
With emerging treatment modalities and therapeutics for Multiple Sclerosis (MS), there is a critical need for improved measures of disability. Routine clinical practice and trials will benefit from devices that are capable of objectively quantifying muscle strength/weakness. We have developed a device for measuring Tibialis Anterior (TA) force that is both objective and easy to use - the Rapid Objective Quantification - TA (ROQ-TA). The purpose of this study was to determine the reliability and validity of the ROQ-TA versus Manual Muscle Testing and Isokinetic Dynamometry (IKD) for evaluating TA force in persons with MS (PwMS).
Methods:
Ankle dorsiflexion of 20 PwMS was assessed by three modalities: ROQ-TA, MMT, and IKD over 2 testing sessions. ICC(2,1) values and Bland-Altman plots were used to assess reliability and validity of the ROQ-TA.
Results:
The ICC(2,1) for reliability for the ROQ-TA was found to be 0.884 (0.690-0.957) while the IKD produced a similar ICC(2,1) of 0.919 (0.784-0.970). The mean difference between the two sessions for the ROQ-TA was -6.4 N with limits of agreement of 42.5 to -55.4 N as inferred by the Bland-Altman plots. With respect to validity, the ROQ-TA versus IKD yielded similar values for both sessions- the mean bias was 9.3 N (SE range: -3.4 to 22 N) for session 1 and 9.9 N for session 2 (SE range: -3.2 to 23.0 N). The ICC(2,1) values between the two devices were in moderate agreement - session 1: 0.579 (-0.125-0.843) and session 2: 0.490 (-0.363-0.809).
Conclusion:
The ROQ-TA is a valid and highly reliable device to test dorsiflexion force in PwMS.
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