Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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Comparison of Subtalar Joint Range of Motion and Dorsiflexor Muscle Activity Between Normal and Pes Planus Feet

정상발과 평발에서의 목말밑 관절가동범위와 등쪽굽힘근의 근활성도 비교

  • Koh, Eun-Kyung (Department of Physical Therapy, Masan University) ;
  • Jung, Do-Young (Department of Physical Therapy, Kinesiopathologic Science Institute, Joongbu University)
  • 고은경 (마산대학교 물리치료과) ;
  • 정도영 (중부대학교 물리치료학과 운동병리과학연구소)
  • Received : 2018.04.19
  • Accepted : 2018.04.24
  • Published : 2018.05.31
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Abstract

PURPOSE: The imbalance of pretibial muscles can be a factor contributing to the development of pes planus. However, no study has yet compared the muscle activity of the tibials anterior (TA) to that of the extensor digitorum longus (EDL). The purpose of this study was to determine whether there are differences in the electromyographic (EMG) TA and EDL amplitude indexes (AIs) between normal and pes planus feet. METHODS: A total of 14 subjects with normal feet and 15 subjects with bilateral pes planus participated in this study. TA and EDL muscle activities were measured using a wireless EMG system and the angles of ankle dorsiflexion and eversion of the subtalar joint were measured using a universal goniometer during active ankle dorsiflexion in the prone position. AI was calculated as follows: $\text{amplitude_{TA}-amplitude_{EDL}/(amplitude_{TA}+amplitude_{EDL})}/2{\times}100$. RESULTS: The AIs of the TA and EDL were significantly lower in pes planus feet than in normal feet (p<.05). The angle of subtalar eversion was significantly greater in pes planus feet than in normal feet during active ankle dorsiflexon (p<.05). However, there was no significant difference in the angle of ankle dorsiflexion between normal feet and pes planus feet (p>.05). CONCLUSION: This study showed that TA muscle activation was lower in pes planus feet than in normal feet, resulting from greater eversion range of motion during active ankle dorsiflexion. We suggest that the imbalance of ankle dorsiflexors must be considered in pes planus management.

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References

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