抄録
We reported 3 cases of Revision Total Knee Arthroplasty (TKA) in a relative early stage of wear of the polyethylene tibial insert.
The periods to the revision TKA from the primary surgery were 4 years 4 months,7 years 9 months and 10 years 5 months. All cases had polyethylene wear, breakage, and metallosis, and one case also had an anterior dislocation of the tibial polyethylene insert. The symptoms in the 2 cases without dislocation were occasional unstable feeling of the knee and slight pain. During regular radiographic follow-up examination, joint space narrowing was discovered on standing A-P view images, and the diagnosis was polyethylene wear. A posterior stabilized prosthesis was used in all revision TKA operations. A stemmed femoral component was used in one case.
Recently reports of failure because of polyethylene wear are increasing. If wear is diagnosed at an early stage, correction is possible by a minimally operation to exchange the polyethylene insert. Because there was no or little pain even in cases of advanced wear, it is important to evaluate the X-P view carefully at the regular radiographic examinations to diagnose polyethylene wear at an early stage.
