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http://dx.doi.org/10.12674/ptk.2016.23.3.021

The Effects of Ultrasound Imaging Visual Feedback During Toe-Spread-Out Exercise in Subjects With Hallux Valgus  

Kang, Sun-young (Company-affiliated Research Institute, Korea Industry Development Institute)
Choung, Sung-dae (Dept. of Physical Therapy, Division of Health Science, Baekseok University)
Shim, Jae-hoon (Dept. of Physical Therapy, Division of Health Science, Baekseok University)
Publication Information
Physical Therapy Korea / v.23, no.3, 2016 , pp. 21-28 More about this Journal
Abstract
Background: The toe-spread-out (TSO) exercise has been introduced as a strengthening exercise for the abductor hallucis muscle in subjects with hallux valgus. Visual biofeedback using ultrasound imaging during exercise, may increase the ability to selectively contract the abductor hallucis muscle, compared with exercise alone. Objects: The aim of this study was to investigate the effects of ultrasound imaging visual feedback during the TSO exercise with respect to its influence on the angle of the first metatarsophalangeal joint (1st MPJ) and the cross-sectional area (CSA) of the abductor hallucis muscle in subjects with hallux valgus. Methods: Twenty-five healthy young subjects with a mean average age of 22.5 years, and a standard deviation of 2.3 years, were recruited for this study. Hallux valgus was defined as an angles greater than $15^{\circ}$ angle of 1st MPJ. Goniometric measurement was used to determine the angle of 1st MPJ. In addition, an ultrasound system was used to collect the CSA of the abductor hallucis muscle in each foot. The angle of the 1st MPJ and CSA of the abductor hallucis were measured in three positions; the resting position, during TSO exercise, and during TSO exercise in conjunction with real-time ultrasound imaging feedback. All data analyzed using a repeated analysis of variance with Bonferroni correction in order to compare the dependent variables in all three positions. Statistical level of significance was set up as p<.05. Results: The angle of the 1st MPJ was noted to be significantly reduced and the CSA of the abductor hallucis to be significantly greater during TSO exercise used in conjunction with ultrasound imaging visual feedback, compared to when the values were recorded during TSO exercise alone (p<.05). Conclusion: Based on these findings, it can be concluded that the application of ultrasound imaging visual feedback during TSO exercise is more effective in contracting selectively the abductor hallucis than the use of exercise alone.
Keywords
Abductor hallucis; Hallux valgus; Metatarsophalangeal Joint; Toe-spread-out; Ultrasound;
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