[Causes of failure after total knee arthroplasty].
To identify the causes of failure after total knee arthroplasty (TKA). Retrospective reviews were conducted for the causes of failures of 181 TKA patients between January 2007 and December 2013. Among the causes of failures after primary TKA, infection was the major cause of failure (53%, 96/181) followed by aseptic loosening (16%, 29/181), arthrofibrosis (10%, 18/181), instability (6.6%, 12/181), extensor mechanism problem (5%, 9/181), wear (4.4%, 8/181), periprosthetic fracture (2.8%, 5/181) and others (2.2%, 4/181). And 64.1% occurred in the first two years, 19.9% occurred between 2 and 5 years and 16.0% occurred after 5 years after operation. Up to 84.0% occurred in 5 years. The top three causes of failures after primary TKA at our center are infection, aseptic loosening and arthrofibrosis.