“Back on Track”: A Mobile App Observational Study Using Apple’s ResearchKit Framework

Martin Zens   ¹ , Dr -Ing, Dr med ;   Peter Woias   ² , Dr -Ing ;   Norbert P Suedkamp   ¹ , Dr med ;   Philipp Niemeyer   ¹ , Dr med

¹ Department of Orthopedic Surgery and Traumatology, University Medical Center Freiburg, University of Freiburg, Freiburg, Germany

² Design of Microsystems, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany