title: Inferior performance of Boneloc bone cement in total knee arthroplasty: a prospective randomized study comparing Boneloc with Palacos using radiostereometry (RSA) in 19 patients.
abstract: We compared Boneloc bone cement with conventional cement (Palacos) in fixating the tibial component during 2-5 years in 19 patients with gonarthrosis undergoing total knee arthroplasty in a prospective randomized study. Boneloc displayed significantly larger migration, subsidence and lift-off than Palacos. The difference was identifiable already within 3 months postoperatively, but became significant at 12 months. In the Boneloc group, all components showed subsidence of the posterior part and lift-off of the anterior part of the tibial component, whereas in the Palacos group, the locations of subsidence and lift-off were evenly distributed about the edge of the implant. At 5 years, both Boneloc knees so far investigated were clinical failures with high migration rates. We conclude that, even in total knee arthroplasty, there is a substantial risk that Boneloc leads to inferior clinical results, but later than in hip replacements.
authors.affiliation: Department of Orthopedics, University Hospital of Umeå, Sweden. kjell.g.nilsson@orthop.umu.se
authors.forename: K G
authors.initials: KG
authors.lastname: Nilsson
authors.forename: T
authors.initials: T
authors.lastname: Dalén
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D008689:Methacrylates / Q000009:adverse effects*; D020366:Methylmethacrylate / Q000627:therapeutic use*; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging* / Q000601:surgery*; D010780:Photogrammetry; D011446:Prospective Studies; D011475:Prosthesis Failure; D011859:Radiography; D012307:Risk Factors; D013997:Time Factors
chemical_list: D008689:Methacrylates; C073735:methylmethacrylate-n-decylmethacrylate-isobornylmethacrylate; D020366:Methylmethacrylate