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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

Type

Description

A

A trochlea with normal shape but with a shallow trochlear groove

B

Flattening of the trochlear groove mounting to a convexity

C

Asymmetry 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

D

Features like that in C type but with a longitudinal link intervening the two facets giving the cliff pattern on the parasagittal plane in MRI