Comparison of bone ingrowth into cobalt chrome sphere and titanium fiber mesh porous coated cementless canine acetabular components.
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).
Jasty
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M
Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston 02114.
Bragdon
C R
CR
Haire
T
T
Mulroy
R D
RD
Harris
W H
WH
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
D002858:Chromium Alloys; D014025:Titanium