Reliability and Validity of the Persian Version of the Foot Function Index in Patients with Foot Disorders

Abstract

Background: Foot function index (FFI) is a worthy subjective patient reported outcome measures (PROM) tool for<br />evaluation of the outcomes of medical interventions on foot and ankle. This study was conducted to assess the validity<br />of the Persian version of the foot function index (FFI).<br />Methods: After translating the original FFI into Persian, back-translation was performed on the agreed Persian version<br />and the final version was established. A total of 113 Persian-speaking patients with foot and ankle problems were<br />enrolled in this study and were asked to fill in the FFI.<br />Results: The Cronbach's alpha for subsections of FFI and MOXFQ was above 0.8 and 0.7, respectively, while it was<br />0.95 and 0.93 for total FFI and MOXFQ, respectively. The ICC for all subsections of MOXFQ and FFI was above 0.7.<br />The Pearson's correlation coefficient for all subsections of FFI and MOXFQ was significant (P<0.01).<br />Conclusion: The Persian version of FFI is valid and reproducible in Persian speaking population.<br />Level of evidence: IV