Dislocation of a polyethylene insert in an infected knee joint after a Triathlon total knee arthroplasty

This report presents the case of a 57-year-old male patient who underwent a total knee arthroplasty (TKA) using an uncemented Triathlon system and subsequently went on to develop a prosthetic joint infection (PJI) with eventual polyethylene insert dislocation. This report presents the clinical, radiological and surgical findings of the insert dislocation on the background of PJI and explores this rare complication of TKA by providing a summary of the literature on this topic.