Mirror movements and brain pathology in children with unilateral cerebral palsy
Hsing-Ching Kuo1,2, Claudio L Ferre1,3, Karen Y Chin1
1Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY, USA.
Insights
Brain lesion type predicts mirror movement strength in children with unilateral cerebral palsy (CP). Higher mirror movements may indicate specific corticospinal tract (CST) patterns and correlate with hand function.
Area of Science:
- Neuroscience
- Pediatrics
- Rehabilitation Medicine
Background:
- Mirror movements, involuntary movements in the contralateral limb during unilateral action, are common in children with unilateral cerebral palsy (CP).
- Understanding the relationship between mirror movements, brain pathology, and motor function is crucial for targeted interventions in CP.
- The corticospinal tract (CST) plays a key role in motor control, and its organization may be affected by brain lesions in CP.
Purpose of the Study:
- To investigate the association between mirror movements and brain lesion type in children with unilateral CP.
- To determine if mirror movements correlate with corticospinal tract (CST) organization.
- To explore the relationship between mirror movements and hand function in children with unilateral CP.
Main Methods:
- Forty-eight children with unilateral CP underwent evaluation of mirror movements, brain lesion type, and CST patterns via transcranial magnetic stimulation.
- Participants performed standardized unilateral hand tasks, and mirror movements were scored using the Woods and Teuber scale.
- Hand function was assessed, and statistical analyses were performed to identify correlations and predictive relationships.
Main Results:
- Children with periventricular lesions exhibited stronger mirror movements than those with middle cerebral artery lesions.
- High mirror movement scores (3-4) were associated with an ipsilateral CST connectivity pattern.
- Significant positive correlations were found between higher mirror movement scores during specific tasks and better unimanual dexterity.
Conclusions:
- Brain lesion type may predict the severity of mirror movements in children with unilateral CP.
- Mirror movement assessment could serve as a potential indicator of CST organization in this population.
- Further research is needed to fully elucidate the complex interplay between brain pathology, mirror movements, and motor outcomes in unilateral CP.
Aim:
We systematically examined the relationship between mirror movements and brain lesion type, corticospinal tract (CST) organization, and hand function to determine the relevance between mirror movements, brain lesion, the CST pattern, and hand function in children with unilateral cerebral palsy (CP).
Method:
Forty-eight children (mean age 9y 9mo [SD 3y 3mo], range 6-18y; 30 males, 18 females) with unilateral CP participated. Mirror movements, brain lesion type, CST pattern identified by transcranial magnetic stimulation, and clinical outcomes were evaluated. Children performed four unilateral tasks: hand opening/closing, finger opposition, individuation, and finger 'walking'. Mirror movements induced in the contralateral hand were scored using standardized criteria (scores 0-4 using the Woods and Teuber scale).
Results:
We found that children with periventricular lesion may have stronger mirror movement scores induced in either hand than those with middle cerebral artery lesion (more affected hand: p=0.02; less affected hand: p<0.01). The highest mirror movement score a child exhibits across the tested tasks (i.e. scores of 3-4 using the Woods and Teuber scoring criteria) may potentially be an indicator of an ipsilateral CST connectivity pattern (p=0.03). Significant correlations were observed between higher mirror movement scores when performing hand opening/closing as well as finger walking and better unimanual dexterity (Spearman's rank correlation coefficient rs =0.44, p=0.002; rs =0.46, p=0.002 respectively).
Interpretation:
Brain lesions may be predictive of the strength of mirror movements in either hand in children with unilateral CP. Our findings warrant further studies to extensively investigate the relationship between mirror movements and the underlying brain pathology.
What This Paper Adds:
Brain lesion type may be predictive of mirror movement scores induced in either hand in children with unilateral cerebral palsy. The highest mirror movement score a child exhibits across the tested tasks may indicate corticospinal tract connectivity pattern in children with unilateral cerebral palsy.
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