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. 2016 Jul 25;13(2):128–135. doi: 10.1007/s11420-016-9516-6

Fig. 3.

Fig. 3

Plain axial knee radiograph showing measurements of the sulcus angle (angle between lines AB–BC) and the patella congruence angle (PCA) between a line bisecting the sulcus angle and a line connecting the apex of the sulcus to the lowest part of patellar ridge (BD) (normal value of PCA −6 ± 11). Figure obtained with permission from Wolters Kluwer Health, Aglietti P, Insall JN, Cerulli G. Patellar Pain and Incongruence. I: Measurements of Incongruence. Clin Orthop Relat Res. 1983; 176: 217–224.