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📌 Dejour et al. Classification of Trochlear Dysplasia
1️⃣ Type A
- Signs: Crossing sign laterally
- Axial View: Sulcus angle >145° (shallow trochlea)
- Description: The crossing sign is the only present sign. On axial views, the trochlea is shallower than normal.
2️⃣ Type B
- Signs: Crossing sign and supratrochlear spur laterally
- Axial View: Flat or convex trochlea
- Description: The crossing sign and the supratrochlear spur are present. On axial views, the trochlea is flat.
3️⃣ Type C
- Signs: Crossing sign and double contour sign laterally
- Axial View: Asymmetry of femoral condyles with hypoplastic medial condyle
- Description: The crossing sign and the double contour sign are present, but there is no spur. On axial views, the medial facet is hypoplastic.
4️⃣ Type D
- Signs: Crossing sign, supratrochlear spur, and double contour sign laterally
- Axial View: Asymmetry of condyles with cliff pattern
- Description: Combines the three signs: crossing sign, supratrochlear spur, and double contour. On axial views, there is a cliff pattern.
➡️ 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, #crossingsign, #doublecontoursign, #dejourcriteria, #femoraldeformity, #patelladeformity, #jagerhutdeformity,
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