Association Between Magnetic Resonance Imaging-Based Spinal Morphometry and Sensorimotor Behavior in a Hemicontusion...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Radiology

Background:

• Spinal cord injury (SCI) disrupts structural and functional connectivity, impacting neurological outcomes.
• Magnetic resonance imaging (MRI) is crucial for assessing spinal cord changes and functional connectivity in SCI patients.
• Understanding the relationship between structural spinal cord alterations and neurological recovery is vital for interpreting functional MRI data.

Purpose of the Study:

• To investigate MRI-based spinal morphological changes after cervical SCI in a rat model.
• To determine the relationship between these structural changes and neurological outcomes.
• To provide insights for interpreting functional MRI-based functional connectivity assessments in SCI.

Main Methods:

• Cervical SCI (C4/C5 hemicontusion) was induced in young adult rats.
• Sensorimotor functions were assessed weekly for 6 weeks post-injury.
• Cervical spinal cord MRI was performed at 8 weeks post-injury, followed by morphometric analysis of lesional and nonlesional areas.

Main Results:

• Rats exhibited ipsilesional forelimb motor deficits and hypersensitivity post-SCI.
• MRI revealed T1- and T2-weighted lesions in the injured spinal cords.
• Nonlesional spinal morphometric changes showed a stronger correlation with neurological outcomes than lesional volumes.

Conclusions:

• MRI-based morphometric analysis of nonlesional spinal cord regions is crucial for understanding neurological recovery after SCI.
• These findings aid in the meaningful interpretation of functional MRI data in SCI research.
• The study highlights the importance of considering diverse structural changes for predicting functional outcomes.