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📌MRI Findings in Ligament Injuries

✅ Classification of Ligament Injuries
At MR imaging, ligament injuries can be classified as:
Strains (primarily involve an intact ligament/tendon with surrounding edema)
Partial tears (increased intrasubstance signal intensity and disruption of portions of the muscle/ligament/tendon)
Complete ruptures
These often correspond to the clinical grading of grade I, II, and III injuries, respectively.

✅ Lateral Collateral Ligament (LCL) Injury Patterns
Most common injury patterns of the fibular collateral ligament (LCL) include:
Soft tissue avulsion from the attachment on the femur
Osseous avulsion from the fibular head
According to Juhng et al., avulsion of the LCL usually occurs at its distal attachment from the head of the fibula, rather than its proximal femoral attachment.
In complete LCL disruptions, the ligament demonstrates a wavy or serpiginous contour and loss of ligamentous continuity on MRI.

✅Associated Cruciate Ligament Injuries
Isolated injuries to the posterolateral corner (PLC) of the knee are rare.
PLC injuries usually occur in conjunction with injury to a cruciate ligament (ACL or PCL).

RadioGraphics 2016; 36:1776–1791
Radiol Clin North Am. 2018 Nov;56(6):935-951
Stoller's Orthopaedics and Sports Medicine: The Knee

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