Mohammad M. Sarzaeem - Department of Orthopedic Surgery, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences (SBUMS), Tehran, Iran
Mahmood Jabalameli - Department of Orthopedic Surgery, Shafa Orthopedic Hospital, Iran University of Medical Sciences (IUMS), Tehran, Iran

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.

Lateral femoral condylar fracture, Osteoporosis, Severe varus deformity, Stress fracture, Total knee arthroplasty