MRI of the Meniscus

Area of Science:

• Orthopedic imaging
• Knee anatomy
• Diagnostic radiology

Background:

• The menisci are crucial for knee joint function.
• Accurate diagnosis of meniscal tears is vital for appropriate treatment.
• Magnetic Resonance Imaging (MRI) is the primary modality for evaluating knee menisci.

Purpose of the Study:

• To outline the essential knowledge for accurate MRI diagnosis of meniscal tears.
• To describe the key imaging findings indicative of meniscal tears.
• To discuss common pitfalls and post-surgical changes that can mimic tears.

Main Methods:

• Review of MRI imaging parameters and normal meniscal anatomy.
• Identification and description of imaging signs associated with meniscal tears.
• Analysis of common anatomic variants and post-operative findings.

Main Results:

• Key signs of meniscal tear include linear signal intensity, altered shape, meniscal extrusion, and parameniscal cysts.
• Anatomic variants and post-surgical granulation tissue can mimic meniscal tears.
• Comparison with prior imaging and operative details aids diagnosis.

Conclusions:

• Comprehensive knowledge of MRI findings is essential for accurate meniscal tear diagnosis.
• Awareness of pitfalls like granulation tissue improves diagnostic accuracy.
• MRI is a reliable tool for evaluating knee meniscal pathology.