title: A study of micromotion and appositional bone growth to a canine madreporic-surfaced femoral component.
abstract: A canine total hip arthroplasty model was used to examine micromotion and bone apposition to a proximally two-thirds madreporic-surfaced femoral prosthesis. Micromotion was also measured following initial press-fit implantation into canine cadaveric femora. After initial press-fit fixation and either 6 or 24 months of biologic fixation, micromotion was less than 23 microns in the proximal and midstem regions, a magnitude consistent with bone apposition. Bone apposition was greatest near the junction of the madreporic and smooth surfaces and was not significantly different between 6 and 24 months (51% at 6 months and 47% at 24 months). The quality of the interface tissue appears to be conductive to long-term fixation.
authors.affiliation: Department of Surgery, University of Toronto, Ontario, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Finkelstein
authors.forename: G I
authors.initials: GI
authors.lastname: Anderson
authors.forename: J P
authors.initials: JP
authors.lastname: Waddell
authors.forename: R R
authors.initials: RR
authors.lastname: Richards
authors.forename: T C
authors.initials: TC
authors.lastname: Hearn
authors.forename: E
authors.initials: E
authors.lastname: Schemitsch
mesh_terms: D000818:Animals; D016723:Bone Remodeling; D004195:Disease Models, Animal; D004285:Dogs; D006622:Hip Prosthesis; D011474:Prosthesis Design