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. 2013 Apr 2;471(8):2641–2648. doi: 10.1007/s11999-013-2942-6

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© The Association of Bone and Joint Surgeons® 2013

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Fig. 1 — The Insall-Salvati ratio was calculated by dividing the length of the patella tendon (LT) by the length of the patella (LP) measured from the lateral radiograph. The modified Insall-Salvati ratio was calculated by dividing the distance from the tibial tuberosity to the inferior pole of the articular surface of the patella (LT2) by the length of the articular surface of the patella (LA). (Published with permission and adapted from from Stefanik JJ, Zhu Y, Zumwalt AC, Gross KD, Clancy M, Lynch JA, Frey Law LA, Lewis CE, Roemer FW, Powers CM, Guermazi A, Felson DT. Association between patella alta and the prevalence and worsening of structural features of patellofemoral joint osteoarthritis: the multicenter osteoarthritis study. Arthritis Care Res. 2010; 62: 1258–1265. Copyright (2010) Wiley.)