Trochear dysplasia is a condition where the  trochlear groove is abnormal, usually at its upper end, at which point the groove is abnormally flat or even heaped into a 'bump'.

 

Trochlear dysplasia and kneecap instability

Trochlear dysplasia is commonly associated with an unstable patella (kneecap), and patellar dislocation.

mild trochlear dysplasia with shallow trochlea trochlear dysplasia with a flat upper trochlea with no groove trochlear dysplasia with a trochlear bump
Mild trochlear dysplasia with a shallow trochlear groove. More severe situation where the upper trochlea has no groove at all. Instead of being convex, the trochlear forms a concave 'bump', and the patella finds no comfortable groove into which to slide.
Synonyms: 
dysplastic trochlea
trochlear bump
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Illustrated article showing how the patella starts its engagement with the groove of the trochlea.

Video demonstrating the J sign

This is the Editor's interpretation of a paper published in the orthopaedic literature in 2016.

Explaining how the kneecap glides within the underlying groove of the femur bone.

This video is a record of a meeting held by Dr Lars Blønd in order to bring together his patients who have all had the procedure of arthroscopic trochleoplasty.

Pages

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FORUM DISCUSSIONS

Trochlear dysplasia and patella tilt


CLINICAL PUBLICATIONS

The effect of trochlear dysplasia on patellofemoral biomechanics: a cadaveric study with simulated trochlear deformities. Van Haver A, De Roo K, De Beule M, Labey L, De Baets P, Dejour D, Claessens T, Verdonk P. Am J Sports Med. 2015 Jun;43(6):1354-61.


See also -


Factors contributing to an Unstable Patella - ebook


VIDEO putting trochlear dysplasia into context