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. 2018 Jan 25;6(1):2325967117751659. doi: 10.1177/2325967117751659

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Radiographic patellar height indices, each measured as a ÷ b. (A) Caton-Deschamps ratio, with line a demonstrating the distance between the distal end of the patellar articular surface to the anterosuperior angle of the tibia and line b demonstrating the length of the articular surface of the patella. (B) Blackburne-Peel ratio, with line a being perpendicular to the tibial plateau line and line b measuring the length of the articular surface of the patella. (C) Insall-Salvati ratio, with line a representing the length of the patellar tendon and line b demonstrating the maximum length of the patella.