Journal of Rehabilitation Research & Development (JRRD)

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Volume 51 Number 4, 2014
   Pages 635 — 644

Abstract — Test-retest reliability and rater agreements of Assessment of Capacity for Myoelectric Control version 2.0

Helen Y. N. Lindner, PhD;1–2* Ann Langius-Eklöf, PhD;3 Liselotte M. N. Hermansson, PhD1,4

1School of Health and Medical Sciences and 2Centre for Rehabilitation Research, Örebro University Hospital, Örebro, Sweden; 3Department of Neurobiology, Care Sciences and Society, Karolinska Institute, Stockholm, Sweden; 4Department of Prosthetics and Orthotics, Örebro University Hospital, Örebro, Sweden

Abstract — The Assessment of Capacity for Myoelectric Control (ACMC) is an observation-based tool that evaluates ability to control a myoelectric prosthetic hand. Validity evidence led to ACMC version 2.0, but the test-retest reliability and minimal detectable change (MDC) of the ACMC have never been evaluated. Investigation of rater agreements in this version was also needed because it has new definitions in certain rating categories and items. Upper-limb prosthesis users (n = 25, 15 congenital, 10 acquired; mean age 27.5 yr) performed one standardized activity twice, 2 to 5 wk apart. Activity performances were videorecorded and assessed by two ACMC raters. Data were analyzed by weighted kappa, intraclass correlation coefficient (ICC), and Bland-Altman method. For test-retest reliability, weighted kappa agreements were fair to excellent (0.52 to 1.00), ICC2,1 was 0.94, and one user was located outside the limits of agreement in the Bland-Altman plot. MDC95 was less than or equal to 0.55 logits (1 rater) and 0.69 logits (2 raters). For interrater reliability, weighted kappa agreements were fair to excellent in both sessions (0.44 to 1.00), and ICC2,1 was 0.95 (test) and 0.92 (retest). Intrarater agreement (rater 1) was also excellent (ICC3,1 0.98). Evidence regarding the reliability of the ACMC is satisfactory and MDC95 can be used to indicate change.

Key words:ACMC, assessment, capacity, myoelectric control, myoelectric prosthetic hand, prosthesis, prosthetic hand control, rater agreement, test-retest, upper limb.


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This article and any supplementary material should be cited as follows:
Lindner HY, Langius-Eklöf A, Hermansson LM. Test-retest reliability and rater agreements of Assessment of Capacity for Myoelectric Control version 2.0. J Rehabil Res Dev. 2014;51(4):635–44.
http://dx.doi.org/10.1682/JRRD.2013.09.0197
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