Mechanical and histological fixation of hydroxylapatite-coated pyrolytic carbon and titanium alloy implants: a report of short-term results

Journal of Applied Biomaterials : an Official Journal of the Society for Biomaterials
V J HetheringtonS A Brown

Abstract

Historically, pyrolytic carbon has been a material for cardiovascular applications, but it has several properties suited for orthopedic uses as well. Pyrolytic carbon has an elastic modulus similar to bone and is highly fatigue resistant, but has not been used in orthopedics because of poor fixation to bone. Plasma sprayed hydroxylapatite (HA) has significantly improved the bonding of bone to titanium alloy implants. The effect of plasma-sprayed HA on pyrolytic carbon implants was investigated in this study. Cylindrical samples were implanted through a single cortex in Beagle femurs. The animals were sacrificed after 8 weeks, and a mechanical push-out test was performed on the implants immediately after explantation. Samples were microradiographed, stained for histology, and examined histomorphometrically. Interface strength for each type of implant was calculated. Pyrolytic carbon showed almost no attachment strength with an average strength value of 1.59 MPa. HA-coated pyrolytic carbon (8.71 MPa) yielded the same interfacial strength as HA-coated titanium (8.71 MPa). Histology revealed that bone was in direct apposition to all implants, both HA coated and noncoated. Failures occurred between the core material and the coating,...Continue Reading

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Citations

Jan 1, 1997·Archives of Orthopaedic and Trauma Surgery·R T Müller, T Patsalis
Jan 31, 2004·The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons·Vincent J HetheringtonBhaskar Bhattacharyya
Oct 12, 2014·Chirurgie de la main·J D WerthelP Loriaut
May 8, 2013·Journal of Biomedical Materials Research. Part a·Alexander HoppePeter Greil
Dec 22, 2015·Journal of Shoulder and Elbow Surgery·Marc-Olivier GauciYves Allieu
Nov 18, 2005·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Chun-Cheng ChenShinn-Jyh Ding
Sep 15, 2011·The Journal of Bone and Joint Surgery. American Volume·Thomas M Sweets, Peter J Stern

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