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'.
|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 at its upper end forms a concave 'bump', and the patella finds no comfortable groove into which to engage.|
Trochlear dysplasia and kneecap instability
Trochlear dysplasia is commonly associated with an unstable patella (kneecap), and patellar dislocation.
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.
Trochlear dysplasia: imaging and treatment options. Batailler C and Neyret P. EFORT Open Rev. 2018 May; 3(5): 240–247.
Arthroscopic deepening trochleoplasty for chronic anterior knee pain after previous failed conservative and arthroscopic treatment. Report of two cases. Blønd L. Int J Surg Case Rep. 2017; 40: 63–68.
See also -
VIDEO putting trochlear dysplasia into context