Tibial plateau stress fracture after unicondylar knee arthroplasty using a navigation system: two case reports. - Seon, Jong; Song, Eun; Yoon, Taek; Seo, Hyoung; Cho, Sang; Seon, Jong Keun; Song, Eun Kyoo; Yoon, Taek Rim; Seo, Hyoung Yeon; Cho, Sang Gwon (Knee Surgery, Sports Traumatology, Arthroscopy, 2007)