“…In this case, the patient's symptomatic tricompartmental arthritis and failure of conservative management with physical therapy, nonsteroidal anti-inflammatory medications, and intraarticular steroid injections led to the recommendation of surgical treatment with TKA. Based on the experience with this case as well as a review of the existing literature, the main challenges of TKA after ipsilateral BKA include surgical positioning, tibial component alignment, and postoperative rehab protocol [ [8] , [13] , [18] , [19] , [20] , [21] , [22] , [23] , [24] ]. A brief overview of studies describing BKA after ipsilateral TKA, including 8 patients with 9 TKAs, is given in Table 1 .…”