[What effect does the hydroxyapatite coating have in cementless knee arthroplasty?].
The goal of this study was to compare the migration of noncemented diffusion sintered titanium fibermesh-coated tibial components with (HA group) and without (non-HA group) additional hydroxyapatite coating. For this purpose digital radiostereometry (DIRSA) was used to compare the migration after 2 and 9 years for the two groups. After 2 years the mean maximum subsidence of the HA-coated components (0.24+/-0.18 mm) was about one-half of the mean maximum subsidence of the non-HA-coated group (0.55+/-0.55 mm). After 9 years the maximum subsidence of the HA-coated components was still smaller, but not as pronounced as before. The same trend was also found for the endpoint maximum total point motion (MTPM). After 2 years the mean MTPM of the HA-coated components was 0.66+/-0.38 mm and of the non-HA group 0.73+/-0.50 mm. After 9 years the mean MTPM for the HA-coated components was 0.54+/-0.15 mm and for the non-HA-coated components 0.74+/-0.20 mm. None of the HA-coated tibial components but one of the non-HA group had to be revised and exchanged due to aseptic loosening.
Hildebrand
R
R
Klinik für Orthopädie und Rheumatologie, Philipps-Universität, Marburg. hildebr2@post.med.uni-marburg.de
Trappmann
D
D
Georg
C
C
Müller
H H
HH
Koller
M
M
Klose
K J
KJ
Griss
P
P
Kienapfel
H
H
D000368:Aged; D000369:Aged, 80 and over; D020099:Coated Materials, Biocompatible; D017886:Durapatite; D019544:Equipment Failure Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007720:Knee Prosthesis; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010780:Photogrammetry; D011183:Postoperative Complications / Q000473:pathology / Q000601:surgery; D011446:Prospective Studies; D011474:Prosthesis Design; D012086:Reoperation; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D017886:Durapatite
Welchen Effekt hat die Hydroxylapatitbeschichtung beim zementfreien Kniegelenkersatz? Eine prospektiv randomisierte RSA-Langzeitstudie über 9 Jahre.