title: Bone compaction enhances fixation of weight-bearing hydroxyapatite-coated implants.
abstract: The effect of bone compaction vs conventional drilling on the fixation of hydroxyapatite-coated implants was examined in a weight-bearing canine model. In each dog, one knee joint had the implant cavity prepared with drilling, the other with compaction. Eight dogs were euthanized after 2 weeks and 8 dogs after 4 weeks. Femoral condyles from additional 7 dogs represented time 0. Compacted specimens had significantly higher bone implant contact and energy absorption at time 0. Compaction significantly increased ultimate shear strength at 0 and 2 weeks. There was no significant difference in implant fixation after 4 weeks. The results of this study suggest that compaction may be beneficial in optimizing the crucial initial implant stability, even when hydroxyapatite-coated implants with osteoconductive properties are inserted in vivo.
authors.affiliation: Orthopaedic Research Laboratory, Department of Orthopaedics, Aarhus University Hospital, Aarhus, Denmark.
authors.forename: Søren
authors.initials: S
authors.lastname: Kold
authors.forename: Ole
authors.initials: O
authors.lastname: Rahbek
authors.forename: Marianne
authors.initials: M
authors.lastname: Vestermark
authors.forename: Søren
authors.initials: S
authors.lastname: Overgaard
authors.forename: Kjeld
authors.initials: K
authors.lastname: Søballe
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D004285:Dogs; D017886:Durapatite; D005260:Female; D007720:Knee Prosthesis; D008297:Male; D011474:Prosthesis Design; D016474:Weight-Bearing
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite