title: Comparison of bone ingrowth into cobalt chrome sphere and titanium fiber mesh porous coated cementless canine acetabular components.
abstract: Bone ingrowth into uncemented hemispherical canine acetabular components porous-coated with cobalt chrome spheres was compared to those porous-coated with titanium fiber mesh. While good bone ingrowth was noted in both types of porous coatings at 6 weeks after surgery with no difference in the histologic quality of the ingrown bone, quantitation of bone ingrowth showed that significantly more bone grew into titanium fiber mesh porous-coated components. The mean amount of bone ingrowth measured 10.5% of the area of the porous coating with fiber mesh coatings and only 5.5% of the area of the porous coating with spherical coatings (significant difference at P < .0005). The mean area density of the ingrown bone inside the pores measured 21.5% of the pore area with fiber mesh coatings, also significantly greater than 13.4% of the pore area with sphere coatings (P < .025). The ingrown bone penetrated a mean 66% of the depth of the porous layer with fiber mesh coatings compared to 32% of the depth of the porous layer with spherical coating (significant difference at P < .0005). The mean extent of the periphery of the porous layer with bone ingrowth was 88% for the mesh coatings and 55% for the spherical coatings (also a significant difference at P < .01).
authors.affiliation: Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston 02114.
authors.forename: M
authors.initials: M
authors.lastname: Jasty
authors.forename: C R
authors.initials: CR
authors.lastname: Bragdon
authors.forename: T
authors.initials: T
authors.lastname: Haire
authors.forename: R D
authors.initials: RD
authors.lastname: Mulroy
authors.forename: W H
authors.initials: WH
authors.lastname: Harris
mesh_terms: D000077:Acetabulum / Q000254:growth & development / Q000502:physiology* / Q000648:ultrastructure; D000818:Animals; D001846:Bone Development / Q000502:physiology*; D002858:Chromium Alloys; D004285:Dogs; D006801:Humans; D007595:Joint Prosthesis; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D019736:Prostheses and Implants; D014025:Titanium
chemical_list: D002858:Chromium Alloys; D014025:Titanium