Different Load-Induced Alterations in Intervertebral Discs Between Low Back Pain Patients and Controls: A T2-map...

Area of Science:

• Biomedical Engineering
• Radiology
• Orthopedics

Background:

• T2-mapping MRI quantifies intervertebral disc (IVD) composition and integrity.
• Previous studies suggest load-induced T2-map differences between low back pain (LBP) patients and controls.
• Larger studies are needed to understand specific IVD changes in LBP patients.

Purpose of the Study:

• To investigate load-induced effects on lumbar IVDs.
• To compare these effects between LBP patients and healthy controls.

Main Methods:

• Prospective cohort study involving 178 LBP patients and 74 controls.
• Quantitative MRI T2-mapping of lumbar IVDs in supine position with and without axial load.
• Analysis of mean T2-map values in entire and posterior IVD regions, adjusted for degeneration grade.

Main Results:

• Axial loading increased T2-map values in both groups.
• LBP patients exhibited a smaller T2-map increase in entire IVDs (0.98-fold change, P=0.031) and posterior IVD parts (0.98-fold change, P=0.005; 0.9-fold change, P=0.015) compared to controls.
• Observed load-induced T2-map variations ranged from -15% to +35% in patients and -11% to +36% in controls.

Conclusions:

• Quantitative MRI confirms distinct load-induced biomechanical behaviors in IVDs between LBP patients and controls.
• These differences suggest deviant IVD characteristics in LBP patients beyond global degeneration.
• Findings contribute to identifying specific IVD phenotypes associated with LBP.