Olavo Kyosen Nakamura MD, Presenter: Nothing to Disclose

Yves Bohrer Costa MD, Abstract Co-Author: Nothing to Disclose

Juliana Frota Guimaraes MD, Abstract Co-Author: Nothing to Disclose

Luciana Satiro Timbo MD, Abstract Co-Author: Nothing to Disclose

Luiz Guilherme Hartmann MD, Abstract Co-Author: Nothing to Disclose

Durval Do Carmo Barros Santos MD, Abstract Co-Author: Nothing to Disclose

Carlos Henrique Longo MD, Abstract Co-Author: Nothing to Disclose

Laercio A. Rosemberg MD, Abstract Co-Author: Nothing to Disclose

Marcelo B. Funari MD, Abstract Co-Author: Nothing to Disclose

To evaluate the association between Osgood-Schlatter disease and patella alta using MRI.

A retrospective case-control study included patients evaluated by MRI of the knee performed in the period from January 2009 to December 2011 at our hospital. We included 103 patients with late sequel of Osgood-Schlatter disease (94 males and 9 females, average 37 years-old) and 393 controls without Osgood-Schlatter disease (326 males, and 67 females, average 41 years-old). Patients with Osgood-Schlatter disease in acute phase, patients younger than 15 years, prior surgery, fracture and bone deformities of the knee, and quadriceps and patellar tendon injuries were excluded. Patellar height was calculated using Insall-Salvati index technique and reference indexes on MRI were based in Shabshin et al published study. All case and control exams were independently evaluated by two radiologists. The used statistical methodologies were scatter and Bland Altman plots, intraclass correlation and kappa coefficients, and Fisher's exact tests. 

In the comparison between cases and controls, there was association with statistical significance between Osgood-Schlatter disease and patella alta (p<0.001). There was also a high intraclass correlation coefficient (0.785, 95% CI 0.593-0.872). 

As demonstrated in the study, there was a statistical significant association between Osgood-Schlatter disease and patella alta and a good interobserver concordance. This fact highlights the importance of the evaluation for patellar height by Insall-Salvati index technique on MRI of the knees in patients with sequelae of Osgood-Schlatter.

In patients with Osgood-Schlatter disease, radiologists must be aware to the presence of patella alta, which can be important to the therapeutic decision and detection of associated lesions.

Nakamura, O, Costa, Y, Guimaraes, J, Timbo, L, Hartmann, L, Santos, D, Longo, C, Rosemberg, L, Funari, M, Osgood-Schlatter Disease and Patella Alta on MRI: Is There Any Association?.  Radiological Society of North America 2013 Scientific Assembly and Annual Meeting, December 1 - December 6, 2013 ,Chicago IL. http://archive.rsna.org/2013/13018087.html