Orthoradiographic measurement employing the "Farill technique" is a routine study in the majority of radiological services. For more than half a century, this method has been widely utilized by specialists in several areas for both measuring and treating differences in length between lower extremities. Nevertheless, technical procedural details during examination and measurements evaluation have usually been neglected or ignored, affecting the final results and consequently the effectiveness of this method. The present study is aimed at publicizing the details standardized by the authors, restoring accuracy to the technique, besides discussing it in comparison with other methods.

Keywords: Farill, Orthoradiographic measurement, Lower extremities, Difference