UpToDate suggested that you cite an UpToDate topic as a chapter in a book titled UpToDate, edited by Ted. W. Post, published by UpToDate. There are no page numbers to cite, and the publication year for any topic should be the current year.
Author(s). Title of topic review. In: Post TW, ed. Title of Book. UpToDate; Current Year. Accessed [date]. URL
Buchbinder B. Plantar fasciitis. In: Post TW, ed. UpToDate. UpToDate; 2020. Accessed January 9, 2020. https://www.uptodate.com/contents/plantar-fasciitis