Spontaneous, Recurrent Dislodgment of the Polyethylene Tibial Insert After Total Knee Arthroplasty

Dislodgment of a polyethylene insert from the tibial baseplate following total knee arthroplasty is an uncommon event. To our knowledge, it has been described in only four reports in the English-language literature1-4. The extremely low rate of this complication contrasts with the frequent dissociation of polyethylene liners from total hip replacements, as reported at our institution5 and by others6, occurring in association with so-called first-generation uncemented, modular acetabular cup designs.