Effect of foot orthoses and short-foot exercise on the cross-sectional area of the abductor hallucis

NewsBot · Dec 13, 2011

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(this is almosyt a yr old, but only turned up in alerts today!)
Effect of foot orthoses and short-foot exercise on the cross-sectional area of the abductor hallucis muscle in subjects with pes planus: A randomized controlled trial.
Jung DY, Koh EK, Kwon OY.
J Back Musculoskelet Rehabil. 2011 Jan 1;24(4):225-31.

Objective: To prevent overuse injuries related to excessively pronated feet, the strengthening of the foot intrinsic muscles has been recommended. The purpose of this study was to examine the effects of foot orthoses and a short-foot exercise intervention on the cross-sectional area (CSA) of the abductor hallucis (AbdH) muscle and strength of the flexor hallucis (FH) in subjects with pes planus.

Methods: Twenty-eight subjects with pes planus were randomly assigned to the foot orthosis (FO) group or the combined foot orthosis and short-foot exercise (FOSF) group for an 8-week intervention. The CSA of the AbdH muscle and the strength of FH were assessed before and after intervention. Data were analyzed using a mixed-model ANOVA.

Results: Significant group by intervention interaction effects were observed in CSA of the AbdH (p=0.009) and strength of the FH (p=0.015). The results of the post hoc paired t-test showed that that the CSA of the AbdH muscle and the strength of the FH significantly increased after the intervention in both groups (p=0.000). The mean CSA of the AbdH muscle and the strength of FH were significantly greater in subjects in the FOSF group compared with subjects in the FO group (mean difference of FO vs. FOSF=13.61 mm<formula>^{2}</formula> in CSA of AbdH muscle; 0.90 kgf in strength of FH; p=0.008).

Conclusions: Results from this study demonstrate that foot orthoses combined with short-foot exercise is more effective in increasing the CSA of the AbdH muscle and the strength of FH compared with foot orthoses alone. Therefore, foot orthoses combined with short-foot exercise are recommended for improving strength of AbdH muscle in subjects with pes planus.
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Craig Payne · Dec 13, 2011

NewsBot said: ↑

the CSA of the AbdH muscle and the strength of the FH significantly increased after the intervention in both groups (p=0.000)
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This means that the strength of the muscles in the orthotic only group got stronger! (they got even stronger in the orthotic + exercise group).

We now have 3 studies that have looked at muscle strength and the use of foot orthoses. Two showed the muscles got stronger and one showed that there was no difference (ie they did not get weaker).

Ironically, the two studies that showed they got stronger were not done by Podiatrists. The one that showed no difference was done by a Podiatrist!

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Craig Payne Moderator

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