Enhanced fixation of uncemented knee replacement with hydroxyapatite

摘要

Early results with bioactive coatings on arthroplasty prostheses have been encouraging. Most information to date however concerns total hip arthroplasty, with few reports regarding the knee. Although the published results of cemented knee arthroplasty are good, growing concerns with cement fixation have lead to an increasing trend for cementless fixation. Simple press-fit total knee prostheses however have not demonstrated enough intrinsic stability, and ingrowth into porous coated implants is inconsistent, possibly because of inexact bone cuts. Preliminary reports by Epinette have suggested that hydroxyapatite (HA) coated implants may improve stability & fixation of total knee arthroplasty (TKR), but no studies to date have examined the bone prosthesis interfaces by accurate, screened radiology. The purpose of this study was to prospectively examine the role of HA in promoting osseointegration into knee prostheses.