title: Minimum 5-year follow-up and radiologic analysis of the all-polyethylene tibial component of the Kinemax Plus system.
abstract: All-polyethylene tibial components remain controversial. We report a series of 249 cemented Kinemax Plus total knee arthroplasties using an all-polyethylene tibial component. After a minimum of 5 years, the median Knee Society pain, Knee Society function, and Hospital for Special Surgery Scores were 89, 60, and 83.5 with 86% good or excellent results. The cumulative survival rate was 94.5% at 7 years. Of tibial components, 38% had a radiolucent line, but only 1% had significant radiolucencies. The presence of a radiolucent line did not affect Knee Society or Hospital for Special Surgery scores adversely. This series is comparable to other series using either an all-polyethylene or a metal-backed tibial component. There currently is no good evidence that the experimentally superior metal-backed tibial components offer any advantage in practice.
authors.affiliation: Department of Orthopaedics, Derbyshire Royal Infirmary, Derby, United Kingdom. mcforster@doctors.org.uk
authors.forename: Mark C
authors.initials: MC
authors.lastname: Forster
authors.forename: Paresh
authors.initials: P
authors.lastname: Kothari
authors.forename: Peter W
authors.initials: PW
authors.lastname: Howard
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D020959:Polyethylene; D011859:Radiography; D015996:Survival Rate; D013977:Tibia; D013997:Time Factors
chemical_list: D020959:Polyethylene