MRI of the Knee by Nicolae V. Bolog Gustav Andreisek & Erika J. Ulbrich

Author:Nicolae V. Bolog, Gustav Andreisek & Erika J. Ulbrich
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

7.1.2 Femoropatellar Joint

The femoropatellar joint is formed by the posterior intra-articular surface of the patella and its counterpart represented by the femur trochlea. The articular congruence between femoral and patellar surfaces enables the static stability of the patella. However, there are anatomical variants of the patellar facet sizes by comparing the configuration of the medial and lateral bony facets [13]. In Wiberg type I patella (prevalence of 10 %), the medial and lateral facets are concave and are almost equal in size (Fig. 7.3). In Wiberg type II patella (prevalence of 65 %), the medial facet is flat and is smaller than the lateral facet (Fig. 7.4). In Wiberg type III patella (prevalence of 25 %), the medial facet is also smaller than the lateral facet but has a convex shape (Fig. 7.5). The femoral trochlea consists of the medial and lateral facets of the femoral sulcus or femoral groove. On axial MR imaging, the lateral facet of the trochlea is more elevated and larger than the medial facet. The sulcus angle of the trochlea is normally less than 144° [14].

Fig. 7.3Wiberg type I patella in a 45 year old female. Axial proton-density (PD) FSE fat-suppressed image shows that the medial (large arrow) and lateral (small arrow) facets are concave and are almost equal in size

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