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. 2021 Mar 21;3(2):e359–e365. doi: 10.1016/j.asmr.2020.09.026

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© 2020 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig 1 — Lateral view of left knee. (1) BPI measurements: a) the perpendicular distance from a line projected anteriorly off of the tibial plateau slope to the inferior patellar articular surface and b) the length of the entire patellar articular surface. (2) ISI measurements: a) the distance from the tibial tubercle to the inferior pole of the patella and b) the diagonal length from the inferior pole of the patella to the superior patellar articular surface. (3) CDI measurements: a) the distance from the tip of the anterosuperior angle of the tibia to the inferior patellar articular surface and b) the length of the entire patellar articular surface. (BPI, Blackburne–Peel index; CDI, Caton–Deschamps index; ISI, Insall–Salvati index.)