Changes in lumbosacral spinal nerve roots on diffusion tensor imaging in spinal stenosis

Area of Science:

• Radiology
• Neurology
• Orthopedics

Background:

• Lumbosacral degenerative disc disease frequently causes lower back and leg pain.
• Conventional T1-weighted imaging (T1WI) and T2-weighted imaging (T2WI) are standard for spinal cord degeneration but cannot fully image lumbosacral nerve roots.
• Assessing nerve root compression is crucial for understanding pain mechanisms.

Purpose of the Study:

• To evaluate the utility of diffusion tensor imaging (DTI) for quantitative assessment of compressed lumbosacral spinal nerve roots.
• To compare DTI findings with conventional MRI in patients with lumbosacral stenosis.

Main Methods:

• Diffusion tensor imaging (DTI) was performed on 20 healthy volunteers and 31 patients with lumbosacral stenosis.
• Conventional T1WI and T2WI were used to assess spinal canal and nerve root morphology.
• Fractional anisotropy (FA) values were analyzed in lumbosacral nerve roots.

Main Results:

• Conventional MRI showed compression in 74 lumbosacral nerve roots across 31 patients.
• DTI identified thinning/distortion in 49% and abruption in 23% of compressed nerve roots.
• Reduced fractional anisotropy (FA) values were observed in the nerve roots of patients with lumbosacral stenosis.

Conclusions:

• Diffusion tensor imaging (DTI) provides objective and quantitative evaluation of lumbosacral spinal nerve root compression severity.
• DTI can detect nerve root abnormalities not apparent with standard MRI techniques.
• This technique holds promise for improved diagnosis and management of lumbosacral stenosis.