MRI of the cartilage

Area of Science:

• Radiology
• Orthopedics
• Medical Imaging

Background:

• Hyaline articular cartilage visualization has advanced significantly with modern MRI techniques.
• Understanding cartilage damage pathogenesis is crucial due to its prevalence and impact.
• High-resolution MRI with surface coils and fat suppression enables detailed cartilage imaging.

Purpose of the Study:

• To review current Magnetic Resonance Imaging (MRI) methods for visualizing hyaline articular cartilage.
• To suggest recommended standards for MRI protocols in cartilage assessment.
• To highlight the necessity of specific MRI sequences for accurate diagnosis.

Main Methods:

• Discussion of fat-suppressed gradient-echo sequences for cartilage thickness and surface imaging.
• Explanation of fast spin-echo (FSE) sequences for assessing internal cartilage structures.
• Consideration of direct MR arthrography as an add-on procedure for ambiguous cases.

Main Results:

• Fat-suppressed 3D gradient-echo MRI accurately depicts cartilage thickness and surface.
• Fast spin-echo (FSE) MRI effectively visualizes internal cartilage structures, both normal and abnormal.
• Combined use of these sequences is recommended for a standard MRI protocol for cartilage.

Conclusions:

• Modern MRI techniques, particularly fat-suppressed gradient-echo and FSE, allow routine and detailed visualization of articular cartilage.
• Both gradient-echo and FSE sequences are necessary components of a standard MRI protocol for comprehensive cartilage evaluation.
• Direct MR arthrography remains the standard for diagnostically challenging cases requiring therapeutic decisions.