Using diffusion tensor imaging to identify corticospinal tract projection patterns in children with unilateral spastic cerebral palsy.
Hsing-Ching Kuo, Claudio L Ferre, Jason B Carmel and 6 others
PMID 27465858WHAT IT FOUND
Diffusion tensor imaging (DTI) identified the corticospinal tract in 81.8% of cases where TMS confirmed it, offering a practical alternative for children who cannot tolerate TMS.
In children with bilateral connectivity, the tract from the damaged side showed poorer integrity than the healthy side.
Key findings
01DTI had a sensitivity of 81.8% and specificity of 77.8% for identifying the contralateral corticospinal tract when compared against TMS.
02Among children with bilateral connectivity, the ipsilateral corticospinal tract showed higher fractional anisotropy and volume, and lower diffusivity, indicating better structural integrity than the contralateral tract.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Small sample size (n=20) limits generalizability. Participants had mild to moderate hand function (MACS I–III); results may not apply to children with severe impairments (MACS IV–V). No control group of typically developing children or those with postnatal lesions. DTI protocols vary widely between clinics, so the specific sensitivity/specificity found here may not replicate elsewhere. TMS stimulation was sometimes limited by child tolerance, which may have caused false negatives in the TMS reference standard.
Declared interests
The study was supported by the National Institutes of Health (N.I.H., Extramural). No other conflicts of interest are reported in the provided text.
The easy way to misread this
Do not assume DTI is a perfect substitute for TMS in clinical decision-making. The study showed four discrepancies out of twenty cases, and the sensitivity/specificity estimates have wide confidence intervals due to the small sample size. Clinical correlation with functional assessment remains essential.