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📌 Five patellofemoral joint instability indices for assessing the trochlear dysplasia
1️⃣ Sulcus Angle (SA):
- Measures the angle between the lines defining the lateral and medial trochlear facets.
- A normal SA is around 145°. Higher values indicate pathological flattening.
2️⃣ Trochlear Facet Asymmetry (TFA):
- Ratio between the lengths of the medial and lateral trochlear facets.
- A TFA less than 40% indicates dysplasia.
- Measured 3 cm above the femorotibial joint space.
3️⃣ Lateral Trochlear Inclination (LTI):
- Angle between the subchondral bone of the lateral trochlear facet and the posterior femoral condylar line.
- An LTI angle of less than 11° is considered abnormal.
- Assessed on the first craniocaudal image showing trochlear cartilage.
4️⃣ Trochlear Groove Depth (TGD):
- Depth measured using lines connecting the posterior femoral condyles and the deepest point of the trochlear groove.
- A depth less than 3 mm indicates dysplasia.
5️⃣ Ventral Trochlear Prominence (VTP):
- Perpendicular distance between the most ventral point of the trochlear groove and a line parallel to the ventral cortical surface of the distal femur.
- Pathologic threshold values vary; commonly cited values are 3 mm (Dejour et al.) and 8 mm (Pfirrmann et al.).
➡️ References:
Knee Surg Relat Res. 2023 Mar 13;35(1):7
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
© 2022 MSK MRI Jee Eun Lee All Rights Reserved.
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#TrochlearDysplasia, #PatellofemoralInstability, #SulcusAngle, #TrochlearFacetAsymmetry, #LateralTrochlearInclination, #TrochlearGrooveDepth, #VentralTrochlearProminence, #OrthopedicRadiology, #KneeMRI,
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