Hydroxyapatite coating on carbon composite hip implants in dogs.
In 33 dogs we implanted femoral stems made either of carbon composite, some coated with hydroxyapatite, or of titanium alloy with a porous coating. Osseointegration was greater in the hydroxyapatite-coated than in the un-coated stems (p less than 0.001). Push-out tests, at an average of 7.2 months after implantation, showed a six-fold increase in interface shear strength and a twelve-fold increase in shear stiffness in the hydroxyapatite-coated group compared with noncoated implants. The highest shear-strength values were found in the porous-coated titanium alloy stems, around which there was also the most resorptive bone remodelling.
Maistrelli
G L
GL
Toronto East General and Orthopaedic Hospital, Ontario, Canada.
Mahomed
N
N
Garbuz
D
D
Fornasier
V
V
Harrington
I J
IJ
Binnington
A
A
D000818:Animals; D001696:Biomechanical Phenomena; D002244:Carbon / Q000008:administration & dosage* / Q000493:pharmacokinetics / Q000494:pharmacology; D000077482:Carbon Fiber; D004285:Dogs; D005269:Femur / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006882:Hydroxyapatites / Q000378:metabolism*; D016348:Osseointegration; D019736:Prostheses and Implants; D011859:Radiography; D016474:Weight-Bearing
D000077482:Carbon Fiber; D006882:Hydroxyapatites; D002244:Carbon