Fig. 1

Representative images of mobile-bearing UKA. a Preoperative X-ray scans at the anteroposterior and lateral views suggested anteromedial osteoarthritis of the knee joint; b preoperative full-length standing anteroposterior radiographs suggested bone-to-bone contact in the medial compartment, with varus angles of 7.96°; c postoperative X-ray scans at the anteroposterior and lateral views suggested acceptable placement of the prosthesis; d postoperative full-length standing anteroposterior radiographs suggested acceptable placement of the prosthesis, with varus angles of 3.71°