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1️⃣ MRI Findings of Acute PCL Injury
✅ Key Indicators:
- Focal discontinuity of fibers.
- The anteroposterior diameter of the ligament distal to the genu is greater than 7 mm.
- Presence of abnormal intermediate or fluid intrasubstance signal, potentially more evident on proton density images.
- Striated appearance of the PCL.
- Lax or wavy appearance of the ligament.
Source: Magnetic Resonance Imaging Clinics of North America. May 2022;30(2):261-275.
2️⃣ Interstitial Tear of the PCL
✅Diagnostic Criteria:
- A greater than 7 mm anteroposterior diameter of the ligament distal to the genu on sagittal T2-weighted sequence is a key indicator.
- Abnormal thickening of the PCL distal to the genu with an anteroposterior diameter greater than 7 mm has a 94% sensitivity and 92% specificity for PCL tears. This finding is consistent regardless of the tear's location.
- The entire ligament or a long segment may be challenging to identify due to diffuse widening and increased signal intensity.
- A long segment of interstitial tear may result in the division into separate fiber bundles.
Source: Stoller's Orthopaedics and Sports Medicine: The Knee.
Magnetic Resonance Imaging Clinics of North America 22 (2014) 557–580.
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