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📌 MPFL Injury in Lateral Patellar Dislocation
✅ Prevalence and Location
- The MPFL is injured in almost all (∼95%) patellar dislocations
- The location of the injury varies: 37% at the patellar attachment, 37% at the femoral attachment, 16% midsubstance, and the remainder at a combination of sites
✅ MRI Findings
- Thickening, intraligamentous fluid, waviness of the fibers, and frank discontinuity indicate MPFL injury
✅ Case Study: Evaluating MPFL Components
1️⃣ Medial Quadriceps Tendon Femoral Ligament Component
- Identified within the purple dotted lines on the proximal axial image
- This patient shows a partial tear compared to normal
2️⃣ Transverse Component
- Highlighted in yellow on the axial image
- Femoral and patellar side partial tear of the transverse component observed
3️⃣ Oblique Decussation Component
- Highlighted in pink, attaches to the proximal superficial MCL fibers
- Femoral and mid-substance partial tear of the oblique decussation component observed
📌 Lateral Patellar Dislocation
✅ MPFL Injury:
- MPFL is injured in ~95% of patellar dislocations
- Injury location varies: 37% patellar attachment, 37% femoral attachment, 16% midsubstance
- MRI findings: thickening, fluid, waviness, discontinuity
✅ Injury Pattern:
- Femoral attachment is weakest part of MPFL
- Patellar insertion reinforced by surrounding structures
- In skeletally immature, patellar-based MPFL/chondral injury more common
➡️ References:
Radiographics. 2023 Jun;43(6):e220177
RadioGraphics 2018; 38:2069–2101
Knee Surg Sports Traumatol Arthrosc. 2019 Jan;27(1):197-205
Knee Surg Sports Traumatol Arthrosc. 2018 Mar;26(3):677-684
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#LateralPatellarDislocation, #MPFL, #MRIFindings, #QuadricepsTendonFemoralLigament, #TransverseComponent, #ObliqueDecussationComponent, #PartialTear, #MCL, #PatelloFemoralLigament, #KneeInjury
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