Insert dissociation after fixed bearing PS constrained Genesis II total knee arthroplasty. A case series of nine patients.

Dissociation of the polyethylene insert after fixed bearing posterior stabilized Genesis II total knee arthroplasty has been rarely described. We present a case series of nine patients with a dissociation of the insert within a period of two years after surgery. Revision surgery was performed in all patients. In this report we discuss clinical presentation, patient characteristics and possible etiologies for tibial insert dissociation seen in the presented cases. In conclusion, tibial insert dissociation does not lead to a uniform clinical presentation. Therefore, in this point of view regular physical examination and imaging after TKA regardless the presence of symptoms seems to be indicated.