Considerations on polyethylene wear in jip total arthroplasty

摘要

INTRODUCTION: The polyethylene wear has been a problem from the introduction of low fraction total arthroplasty until nowadays where influencing many conditions. OBJECTIVE: To describe the technical conditions needed in the total hip arthroplasty to guarantee a greater durability of its components. METHODS: Literature published on this subject is reviewed taking into account the variables affecting the polyethylene wear as well as the possible technical manoeuvres carried out by surgeon to optimize the durability of prosthetic components. RESULTS: The 45º slope of major cupula is directly related to polyethylene wear. Restoration of the hip rotation center with the cupula rotation center has been a significant objective in acetabulum cementation due to reports of its relation to wear. The bone coverage is important to avoid the metal neck clamping against the polyethylene or the metal ring of cupula. CONCLUSION: The surgeon may to change the acetabulum rotation center to achieve an optimal and safe slope and coverage without an increase of incidence of wear adverse effect.