ABSTRACT
Complications associated with posterior-stabilized total knee arthroplasty (TKA) include
patellar clunk syndrome, posterior subluxation of the tibial component, tibial post
wear, and tibial post failure. Recently, an increasing number of reports have been
issued on polyethylene tibial post failure in posterior-stabilized TKA. In most of
these cases, tibial post failure in a well-functioning posterior-stabilized TKA was
suspected based on clinical symptoms, such as a sudden onset of pain, effusion, patellar
clunking, knee instability, and prosthesis dislocation. However, a floating, palpable,
hard, mass-like symptom in the knee joint has not been previously reported. The authors
report a case of a fractured polyethylene tibial post in a posterior-stabilized TKA
that manifested as a palpable mass in the suprapatellar pouch.
