Early Nontraumatic Fracture of the Polyethylene Tibial Post in a NexGen LPS-Flex Posterior Stabilized Knee Prosthesis

Fracture of a polyethylene tibial post in a knee prosthesis after a total knee arthroplasty (TKA) is an uncommon but severe complication of polyethylene tibial post wear. A fractured tibial post results in an unstable and malfunctioning knee. Revision knee surgery is necessary to restore function of the affected knee. We report a case of a nontraumatic fracture of a tibial polyethylene post that occurred in a 63-year-old man with left-sided hemiparesis 3 years after he had undergone left TKA with a NexGen LPS-Flex total knee prosthesis. To our knowledge, this is the first report of a nontraumatic fracture to the tibial post with anterolateral to posterior breakage after a NexGen LPS-Flex TKA.