Subtalar pronator and supinator strength testing

NewsBot · Apr 17, 2015

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Reliability of isometric subtalar pronator and supinator strength testing
Marco Hagen, Matthias Lahner, Martin Winhuysen and Christian Maiwald
Journal of Foot and Ankle Research 2015, 8:15 doi:10.1186/s13047-015-0075-8

Background Due to the specific anatomy of the subtalar joint with its oblique axis, isometric pronator and supinator strength is not well documented. The purpose of this study was to determine intra- and between-session reliability of pronator and supinator strength and lower leg muscle activity measurements during maximum voluntary isometric contractions (MVIC).

Methods Pronator and supinator peak torques (PT), with and without supplementary visual muscle strength biofeedback (FB), and muscular activities of peroneus longus (PL) and tibialis anterior (TA) were assessed twice 3 days apart by the same examiner in 21 healthy young male adults (mean age: 27.6 years; SD = 3.9). Limits of agreement (LoA) and minimum detectable change (MDC) were evaluated.

Results By applying FB, reliability of both pronator and supinator PT was improved: LoA were reduced from 32% to 26% and from 20% to 18% and MDC from 20% to 15% and from 16% to 12% in supinator and pronator PT, respectively. Learning effects in pronator and supinator PT (p < 0.05), which were present without FB, were eliminated using FB. Except for TA during pronation, muscle activities showed low reliability indicated by LoA of 51% to 79%.

Conclusions Using supplementary biofeedback, isometric subtalar pronator and supinator strength testing is reliable in healthy subjects. LoA of 18% and 26% have to be exceeded for pronator and supinator PT, respectively, to detect relevant effects in repeated measures.
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mike weber · Apr 18, 2015

Quiet interesting and at the same time what where they thinking.

they reference Kevin STJ axis paper but use Imans 1969 paper.

so use the fixed axis idea but should understand the axis moves orientation depending on forces at play

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mike weber MVP

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