Improved fixation of porous-coated versus grit-blasted surface texture of hydroxyapatite-coated implants in dogs

Søren Overgaard*, Martin Lind, Ole Rahbek, Cody Bünger, Kjeld Søballe

*Corresponding author af dette arbejde
48 Citationer (Scopus)

Abstrakt

We inserted, in 8 dogs, implants with either porous-coated or grit-blasted titanium surface and coated with hydroxyapatite (HA) into trabecular bone in the proximal humerus, using a 1 mm gap model. After 25 weeks, push-out tests showed that energy absorption for porous-coated implants was twice that of grit-blasted implants, whereas shear stiffness was reduced by one fifth, indicating a stronger fixation of porous-coated implants. Macroscopically, all grit-blasted implants had delamination of the HA coating, whereas porous implants failed mostly at the HA-tissue interface. Porous-coated implants had 47% bone ingrowth and grit-blasted implants 70% (p = 0.02), however, no difference in absolute surface area was found. Part of the HA coating was resorbed during the implantation period as regards volume and thickness. HA coverage was more reduced on porous-coated than on grit-blasted implants (p = 0.01). No foreign-body reaction or osteolysis was seen. An important finding was that one fifth of the surface with complete resorption of HA coating was replaced by newly formed bone.

OriginalsprogEngelsk
TidsskriftActa Orthopaedica Scandinavica
Vol/bind68
Udgave nummer4
Sider (fra-til)337-343
Antal sider7
ISSN0001-6470
DOI
StatusUdgivet - 1997

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