(Fig 4-A.13) Supratrochlear Spur in Trochlear Dysplasia

https://youtu.be/1g7fI8qinVU?si=YkZRzeg0m604uPjj

https://youtu.be/vzxclU_34OI

 

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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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