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  Medical Imaging  ←  MRI of the Knee  ←

Phoenix Diagnostic Clinic

Trochlear dysplazia

 MR imaging of trochlear dysplazia

– Femoral troachlear dysplazia = abnormality of the shape and depth of the trochlear groove mainly in the cranial part

– Leads to pattelar instability and anterior knee pain

– Diagnosis
  Lateral X-Ray:
– crossing sign=floor of the groove crosses the anterior line of the lateral femoral condyle
– the ventral prominence > 3 mm=distance between a line anterior to the femoral shaft and a parallel tangent to the most anterior point of the trochlear floor.

X-Ray trochlear dysplazia
Trochlear dysplazia

Normal knee
Normal knee
Dysplazia - Click to enlarge!
Dysplazia   (Click to enlarge!)

Pfirrmann et al. Radiology 2000;216:858

 MR imaging of trochlear dysplazia
MR imaging of trochlear dysplazia

Diagnosis axial MR:
At 3 cm above joint space
Trochlear depth =([a + b]/2) - c

Cut-off 3 mm

Pfirrmann et al. Radiology 2000;216:858
MR imaging of trochlear dysplazia

Differentials trochlear dysplasia:

Patellar instability

Patella alta

Medial retinaculum
MR imaging of trochlear dysplazia
Clinical symptoms
Anterior knee pain syndrome

Frequent causesUncommon causes

Pattelar instability

Referred pain from the hip

Pattelar tendinopathy

Osteochondritis dissecans

Synovial plica


Patellar bursitis

Perthes’ disease

Quadriceps tendinopathy


Bipartite patella

Osgood-Schlatter disease

Sinding-Larsen-Johansson syndrome

Postoperative impingement

Fat pad impingement


Inflammation Hoffa - Click to enlarge!

Chondromalcia - Click to enlarge!
Inflammation Hoffa    Click to enlarge!
Synovitis - Click to enlarge!
Ostheonecrosis - Click to enlarge!
Synovitis                       Click to enlarge!

September 3, 2009

Phoenix Diagnostic Clinic, Bucharest

This site is primarily intended for use by qualified medical or sport professionals.
If you are a consumer, you should evaluate the information together with your physician or other qualified healthcare professional.
The information provided here is for educational and informational purposes only and should not be considered as a medical advice.
As medical and sport science is permanently changing, we (authors and publishers) use our best efforts to provide accurate information, but we can not warrant that the information in this article and web site is accurate, complete or up-to-date.
This article reflects the opinions and judgments of it's author and may be further updated.
If you have questions regarding this article, please contact the author.
Information belongs to Phoenix Diagnostic Clinic, Bucharest

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