Diffusion Tensor Imaging Findings in Cerebral Sensorimotor Areas in Patients After Spinal Cord Injury Correlate With...

Area of Science:

• Neuroscience
• Radiology
• Neurology

Background:

• Chronic spinal cord injury (SCI) can lead to widespread neurological damage beyond the initial injury site.
• Understanding the extent and impact of remote sensorimotor system degeneration is crucial for patient management.
• Novel diffusion tensor imaging (DTI) techniques offer advanced methods for assessing white matter integrity.

Purpose of the Study:

• To assess sensorimotor cortex and tract degeneration in chronic SCI using DTI templates.
• To correlate DTI findings with clinical and neurophysiological assessments, including motor evoked potentials (MEP).
• To investigate potential DTI biomarkers for remote degeneration in SCI.

Main Methods:

• Recruited 29 patients with chronic SCI (paraplegic and tetraplegic) and 29 age/sex-matched healthy controls.
• Performed neurophysiological assessments (MEP) and 3T MRI with DTI, processed using specialized templates.
• Compared DTI parameters (e.g., fractional anisotropy) between groups using statistical analyses and correlation tests.

Main Results:

• All SCI patients exhibited significantly reduced fractional anisotropy (FA) in sensorimotor tracts and cortices compared to controls.
• Tetraplegic SCI patients showed decreased FA in primary motor (M1) and somatosensory (S1) tracts.
• Higher motor/sensory scores and MEP amplitudes correlated positively with FA in various sensorimotor tracts and cortices.

Conclusions:

• DTI effectively demonstrates remote degeneration of the sensorimotor system in chronic SCI.
• DTI metrics correlate significantly with clinical motor/sensory function and neurophysiological measures.
• DTI parameters show promise as biomarkers for detecting and quantifying remote degeneration in SCI.