Novel Modic grading scoring system and its clinical validation: a preliminary investigation

Area of Science:

• Spinal imaging and diagnostics
• Orthopedic research
• Radiology

Background:

• Modic changes are common findings in spinal imaging.
• Current grading systems may lack comprehensive assessment.
• A standardized scoring system is needed to evaluate Modic changes accurately.

Purpose of the Study:

• To introduce a novel Modic grading scoring system.
• To assess the reliability of the new system.
• To investigate the correlation between the Modic grading score and disc degeneration, herniation, height, and clinical symptoms.

Main Methods:

• A new Modic grading scoring system was developed, incorporating four indicators: invaded vertebral height, invaded endplate length, endplate morphology, and grade of endplate defects.
• The system was applied to 194 patients.
• Interobserver and intraobserver reliability were assessed using kappa values.
• Spearman correlation analysis was employed to examine relationships with disc degeneration, herniation, height, and clinical scores.

Main Results:

• The novel Modic grading scoring system demonstrated substantial to almost perfect interobserver and intraobserver reliability.
• A significant positive correlation was found between the Modic grading score and intervertebral disc degeneration (r=0.757, p<0.001).
• A significant negative correlation was observed between the Modic grading score and intervertebral disc height index (r=-0.231, p<0.001).
• No significant correlations were found with disc herniation or clinical symptom scores (JOA, ODI, VAS).

Conclusions:

• The proposed Modic grading scoring system exhibits good reliability.
• The Modic grading score is a valid indicator of intervertebral disc degeneration.
• The score is also inversely related to intervertebral disc height, suggesting its utility in assessing spinal degeneration.