stress fracture of the lateral femoral condyle aftertotal knee arthroplasty

background: this is to assess one of the rare complications after total knee replacement and to assess risk factors of failure.methods: 11 patients with varus knee and an average age of 67 years underwent tka between 2005 and 2013. all patients returned with a sudden sharp knee pain, disability to walk and significant decrease in rom about 4 to 8 weeks after surgery. radiographic examination revealed a lateral femoral condylar stress fracture.results: after analyzing the images, we found common characteristics among all patients, which might be attributable to the later fracture including varus deformity>25, femoral component lateralization, and valgus correction.conclusion: surgeons should be aware of the risk factors to consider before, during, and after surgery.