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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Eur J Radiol. 2019 Jan 31;113:32–38. doi: 10.1016/j.ejrad.2019.01.033

Figure 1.

Figure 1.

a. Bisect offset: percentage of the widest patella length that is lateral to the line through deepest part of trochlea running perpendicular to the posterior condylar line (PCL). A higher percentage is more laterally displaced; b. Lateral patellar tilt: angle between PCL and the interior bony margin of the patella lateral facet. A higher angle is less lateral tilt; c. Patellar tilt: angle between PCL and patellar width. A higher angle is more lateral tilt; d. Insall–Salvati Ratio ratio of patellar tendon length to longest patella length. Larger number indicates higher position of patella; e. Trochlear angle: angle between PCL and anterior condylar line. Higher angle indicates deeper sulcus laterally; f. Sulcus angle: angle between the lateral and medial trochlear facet margins. Higher number indicates shallower sulcus; g. Lateral trochlear inclination: angle between PCL and lateral trochlear facet. A larger angle indicates a deeper sulcus laterally; h. Medial trochlear inclination: angle between PCL and medial trochlear facet. A larger angle indicates a deeper sulcus medially; i. Difference in length between: (i) line from posterior condylar line to deepest part of sulcus, and (ii) average length of two lines joining posterior condylar line to anterior femoral condyles.