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J Korean Assoc EMG Electrodiagn Med 2003;5(2):92-96.
Published online May 10, 2003.
The Relationship Between Antagonist Muscles using Quantitative Electromyography in Pediatric foot deformity
Objectives: The pathomechanics that result in pediatric foot deformity are not well known. Pediatric foot deformity can result from multiple causes and mechanisms. Some investigators have proposed an imbalance between the muscles associated with ankle movement can result in foot deformity. The purpose of this study was to examine the correlation between pediatric foot deformity and muscle imbalance using quantitative electromyography. Methods: We have studied 60 children with foot deformity. They had measured quantitative EMG of tibialis anterior (TA), peroneus longus (PL), gastrocnemius (GCM), and extensor hallucis longus (EHL) muscles, and classified into each two groups. In one group as varus vs valgus deformities, we evaluated the ratio of TA and GCM (ankle invertors) to PL (ankle evertor), and in another as planus vs equinus, the ratio of TA and EHL (dorsiflexors) to GCM and PL (plantar flexors). And then examined the relationships between the ratio of quantitative EMG of antagonist muscles and foot deformity. Results: The ratio of ankle invertors to evertor showed no significant correlation between varus and valgus foot, and also the ratio of dorsiflexors to plantar flexors between planus and equinus revealed same result. Conclusion: These results suggest that pediatric foot deformities more associated with bony abnormality and secondary contracture of soft tissue rather than muscle imbalance itself. But the children were lack of attention and poor cooperated, so repetitive measures are helpful.
Key Words: Pediatric foot deformity, Quantitative electromyography, Muscle imbalance
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