title: Hydroxyapatite augmentation of the porous coating improves fixation of tibial components. A randomised RSA study in 116 patients.
abstract: In a single-blind, randomised series of knee replacements in 116 patients, we used radiostereometric analysis (RSA) to measure micromotion in three types of tibial implant fixation for two years after knee replacement. We compared hydroxyapatite-augmented porous coating, porous coating, and cemented fixation of the same design of tibial component. At one to two years, porous-coated implants migrated at a statistically significantly higher rate than hydroxyapatite-augmented or cemented implants. There was no significant difference between hydroxyapatite-coated and cemented implants. We conclude that hydroxyapatite augmentation may offer a clinically relevant advantage over a simple porous coating for tibial component fixation, but is no better than cemented fixation.
authors.affiliation: Malmö University Hospital, Sweden.
authors.forename: I
authors.initials: I
authors.lastname: Onsten
authors.forename: A
authors.initials: A
authors.lastname: Nordqvist
authors.forename: A S
authors.initials: AS
authors.lastname: Carlsson
authors.forename: J
authors.initials: J
authors.lastname: Besjakov
authors.forename: S
authors.initials: S
authors.lastname: Shott
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D019645:Arthroplasty, Replacement, Knee; D001843:Bone Cements / Q000627:therapeutic use; D002484:Cementation; D017886:Durapatite; D005260:Female; D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D010780:Photogrammetry; D011095:Polyethylenes; D016062:Porosity; D011474:Prosthesis Design; D011859:Radiography; D016037:Single-Blind Method; D013499:Surface Properties; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery*; D014025:Titanium
chemical_list: D000497:Alloys; D001843:Bone Cements; D011095:Polyethylenes; C031462:titanium alloy (TiAl6V4); D017886:Durapatite; D014025:Titanium