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📌 Dejour et al. Classification of Trochlear Dysplasia Type D Findings
✅ In Type D, three main findings
1️⃣ The Crossing Sign
- The crossing sign indicates the presence of trochlear dysplasia when the sulcus line crosses or lies anterior to the femoral condyle lines.
2️⃣ The Double Contour Sign
- The double contour sign results from asymmetric trochlear facets, with a high lateral facet and hypoplastic medial facet, forming an obliquely oriented articular surface with the patella.
3️⃣ The Supratrochlear Spur
- The supratrochlear spur is found in the superolateral aspect of the trochlea and represents the global prominence of the trochlea, giving a "cliff-like" appearance.
✅ Patellar Comparison
- In a normal knee, note that the lateral facet of the patella projects anterior to the median ridge, representing the normal relationship.
- However, in the case of lateral patellar dislocation, the lateral facet of the patella is seen in a more posterior aspect relative to the median ridge.
➡️ References:
Knee Surg Relat Res. 2023 Mar 13;35(1):7
Clin Sports Med. 2014 Jul;33(3):413-36
MRI Web Clinic – June 2021 Tissue Delamination
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#TrochlearDysplasia, #DejourClassification, #CrossingSign, #DoubleContourSign, #SupratrochlearSpur, #LateralRadiograph, #PatellaDislocation, #KneeAnatomy, #OrthopedicRadiology, #MedicalEducation
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