MR imaging of knee instability.

Area of Science:

• Orthopedic Surgery
• Radiology
• Sports Medicine

Background:

• The knee's global stability relies on complex anatomical structures including cruciate ligaments and medial/lateral stabilizers.
• Recent advancements highlight the significance of the posteromedial and posterolateral knee compartments.
• Surgical repair and reconstruction of these posterior knee structures are increasingly prevalent.

Purpose of the Study:

• To familiarize readers with the normal Magnetic Resonance (MR) imaging appearance of knee stabilizers.
• To illustrate the MR imaging changes associated with injuries to these stabilizing structures.
• To emphasize the importance of accurate diagnosis of posteromedial and posterolateral corner injuries.

Main Methods:

• Review of current literature on knee anatomy and biomechanics.
• Analysis of MR imaging findings in normal and injured knee stabilizers.
• Correlation of imaging findings with clinical significance and treatment outcomes.

Main Results:

• Detailed description of the normal MR imaging characteristics of the anterior and posterior cruciate ligaments, medial collateral ligament complex, and lateral collateral ligament complex.
• Illustration of common injury patterns and their MR imaging manifestations in the posteromedial and posterolateral knee.
• Emphasis on the diagnostic role of MR imaging in identifying injuries critical for surgical planning.

Conclusions:

• Accurate MR imaging interpretation of knee stabilizers, particularly the posteromedial and posterolateral corners, is essential for effective patient management.
• Understanding the MR imaging appearance of these structures aids in diagnosing injuries that impact global knee stability.
• Improved diagnostic accuracy through MR imaging contributes to better surgical outcomes and patient recovery.