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Table 4 Demonstrating the classification of the trochlear dysplasia [7]

From: Role of magnetic resonance imaging in the evaluation of the anterior knee pain

AA trochlea with normal shape but with a shallow trochlear groove
BFlattening of the trochlear groove mounting to a convexity
CAsymmetry of the trochlear facets showing a too high lateral facet and a hypoplastic medial one with a resultant flattened articular surface in an oblique fashion
DFeatures like that in C type but with a longitudinal link intervening the two facets giving the cliff pattern on the parasagittal plane in MRI