[Reliability and concurrent validity of the app Goniometer Pro vs Universal Goniometer in the determination of passive knee flexion].

Background: Smartphones have become a fundamental part of our society, not only everyday, but also professional, since many applications have emerged for the health field. The objective of the study was to analyze the reliability and concurrent validity of an app for iPhone in relation to traditional measurement.

Material And Methods: A non-experimental, double-blind validation and descriptive study.