Short tau inversion recovery MRI of Modic changes: a reliability study

Area of Science:

• Radiology
• Spinal Imaging
• Medical Diagnostics

Background:

• Limited data exist on the reliability of assessing spinal edema changes using short tau inversion recovery (STIR) sequences on MRI.
• Accurate assessment of spinal edema is important for understanding conditions like Modic changes.

Purpose of the Study:

• To evaluate the inter-observer reliability of assessing STIR signal increases associated with Modic changes (MCs) in the lumbar spine using MRI.
• To provide reliability data for STIR sequence interpretation in spinal imaging.

Main Methods:

• Prospective inclusion of 120 patients for the AIM trial.
• Independent evaluation of Modic changes and STIR signal increases by three experienced radiologists.
• Analysis of inter-observer reliability using kappa values and limits of agreement at four lumbar endplates (L4-S1).

Main Results:

• Very good overall agreement (kappa=0.86) for the presence of STIR signal increase.
• Moderate agreement for the categorized height (kappa=0.51), anteroposterior extent (kappa=0.48), and volume (kappa=0.56) of STIR signal increases.
• Quantified differences and limits of agreement for height, extent, and intensity of STIR signal increases.

Conclusions:

• Inter-observer reliability is very good for detecting the presence and intensity of Modic change-related STIR signal increases.
• Reliability for assessing the size (height, extent, volume) of these STIR signal increases is moderate.
• Findings support the use of STIR sequences for evaluating spinal edema related to Modic changes, with awareness of limitations in size assessment.