Hoffa's fat pad impingement syndrome

Case contributed by Dr Andrew Dixon


Anterior knee pain with hyper-mobility.

Patient Data

Age: 35
Gender: Female

MRI Knee

Increased T2 signal within the Hoffa's fat pad located between the proximal patellar tendon and lateral femoral condyle consistent with patellar tendon lateral femoral condyle friction syndrome also known as Hoffa's fat pad impingement syndrome.

Annotated image

Patella height ratio of 1.4 consistent with patella alta. Patella alta is usually defined as a height ratio of > 1.3. Normal ratio is 1.1.  Trochlear dysplasia with asymmetrically small medial facet which is < 40% the width of the lateral facet. 

Case Discussion

Underlying evidence of lateral patellar maltracking with patellar alta and trochlear dysplasia (asymmetrically small medial trochlear facets). The tibial tuberosity to trochlear groove distance is within normal limits.

Chondromalacia patella with generally increased cartilage signal and focal fissuring centrally and trace associated subchondral edema.

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Case information

rID: 16715
Published: 15th Feb 2012
Last edited: 13th Aug 2019
Inclusion in quiz mode: Included

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