Objective: In unicompartmental knee arthroplasty(UKA) , it has been reported that preoperative coronal tibiofemoral subluxation(CTFS)can be corrected partly after surgery. However, large CTFS after UKA may be a risk factor for tibial edge-loading. The purpose of this study was to clarify whether the residual CTFS after medial UKA could be improved the during postoperative period and to identify risk factors in order to make the postoperative CTFS large. Methods: The pre-and postoperative

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... k, one-, two-, and three-year radiographic data of all UKAs(56 knees in 47 patients, performed for medial knee osteoarthritis between January 2012 and December 2013)were analyzed using standardized knee radiographs. Radiographs were obtained as standing anteroposterior films and under preoperative stress. The amount of the CTFS was measured by a method described by Nam D, et al. Results: The CTFS was significantly corrected from 4.9 mm±1.7 in preoperative standing radiographs to 3.7 mm±1.4 in valgus stress radiographs(P=0.