Gait electromyographic evaluation of the long-toe flexors in children with spastic cerebral palsy

Area of Science:

• Neurology
• Biomechanics
• Pediatrics

Background:

• Spastic cerebral palsy (CP) often presents with hindfoot deformities like varus or valgus.
• The role of long-toe flexor muscles in the etiology of these deformities is not fully understood.
• Understanding muscle activity is crucial for effective gait analysis and treatment planning in pediatric CP.

Purpose of the Study:

• To investigate the phasic activity of long-toe flexor muscles in children with spastic cerebral palsy and hindfoot deformity.
• To determine if abnormal electromyography (EMG) findings in these muscles contribute to the development of varus or valgus hindfoot deformities.
• To refine gait analysis protocols for pediatric CP patients with hindfoot deformities.

Main Methods:

• A prospective study involving 37 children diagnosed with spastic cerebral palsy and hindfoot deformity.
• Dynamic electromyography using wire electrodes to measure the electrical activity of the flexor hallucis longus and flexor digitorum longus.
• Analysis of muscle timing and activation patterns during gait.

Main Results:

• Gross abnormalities in the phasic timing of the flexor hallucis longus and flexor digitorum longus were observed.
• Despite observed timing abnormalities, these specific toe flexor muscles could not be implicated as the cause of hindfoot deformity.
• The findings suggest that toe flexor EMG is not essential for gait analysis in CP unless toe curling is a clinical sign.

Conclusions:

• The study suggests that long-toe flexor muscle activity is not etiological in hindfoot deformities in children with spastic cerebral palsy.
• Electromyography of long-toe flexors is likely unnecessary for routine gait analysis in this patient population.
• Gait analysis protocols can be simplified by omitting long-toe flexor EMG unless toe curling is clinically apparent.