Stable migration of peri-apatite-coated uncemented tibial components in a multicentre study
2017
Aims Hydroxyapatite coatings for uncemented fixation in total knee
arthroplasty can theoretically provide a long-lasting biological
interface with the host bone. The objective of this study was to
test this hypothesis with propriety hydroxyapatite, peri-apatite,
coated tibial components using component migration measured with radiostereometric
analysis over two years as an indicator of long-term fixation. Patients and Methods A total of 29 patients at two centres received uncemented PA-coated
tibial components and were followed for two years with radiostereometric
analysis exams to quantify the migration of the component. Results While there was significant variation in individual migration
patterns, the overall migration of the tibial component in the study
group demonstrated a pattern of initial migration followed by stabilisation
after one year, with mean maximum total point motion (MTPM) of 0.02
mm (standard deviation (sd) 0.20) between one and two years
post-operatively. The direction of greatest motion was subsidence,
which stabilised at three months post-operatively (mean translation
of 0.21 mm, sd 0.40). Conclusion The tibial component migration pattern of stabilisation in the
second post-operative year is indicative of successful long-term
fixation for this PA-coated tibial component. Cite this article: Bone Joint J 2017;99-B:1596–1602.
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