Conclusion
RECRUITMENT, KNEE OSTEOARTHRITIS
Advertising on Facebook offers the opportunity to recruit potential study participants nationwide for a web-based physical therapy telehealth study at less cost per person than traditional recruitment methods. Out study adds to the previous literature that few people who clicked on advertisements were ultimately consented into our study. Nevertheless, we still recruited 32% of our total target sample over the first 5 months of our study. In addition, women and individuals aged between 55 and 64 years are the most reached by Facebook advertisements, and consequently, are the people who clicked and consented to participate in our study more frequently. In all, it is recommended that future researchers consider using social media for recruiting adults with knee OA for clinical research given that we found Facebook to be a feasible, cost-saving, and efficient method to recruit study participants for a nationwide telehealth physical therapy study within the United States.The authors would like to thank the Rheumatology Research Foundation and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil—Finance Code 001 for the financial support to the investigators of this study.Conflicts of Interest: None declared.Inclusion and exclusion criteria of the Delaware Physical Exercise and Activity for Knee Osteoarthritis study.