Hydroxyapatite/poly-L-lactide acid screws have better biocompatibility and femoral burr hole closure than does poly-L-lactide acid alone

Author:

Akagi Hiroyuki1,Iwata Munetaka1,Ichinohe Tomu1,Amimoto Hirokazu1,Hayashi Yuuta1,Kannno Nobuo1,Ochi Hiroki2,Fujita Yukihiro3,Harada Yasuji1,Tagawa Masahiro1,Hara Yasushi1

Affiliation:

1. Division of Veterinary Surgery, Department of Veterinary Science, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan

2. Division of Veterinary Microbiology, Department of Veterinary Science, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan

3. Laboratory of Veterinary Surgery, School of Veterinary Medicine, Azabu University, Chuou-ku, Sagamihara, Japan

Abstract

Hydroxyapatite (HA)/poly-l-lactide(PLLA) composite biomaterials are available for orthopedic applications, but bioresorption and cell-mediated inflammation in bone cortex are unknown. We conducted an 84-month follow-up study with Beagle dogs that were subjected to implants with either PLLA (left femur) or HA/PLLA (right femur). Histological and radiographic analysis showed that HA/PLLA screws induced significant increases in HA content from 36 months onward and complete burr hole closure at 60 months, whereas PLLA screws did not. Moreover, PLLA screws induced more severe fibrous tissue and histiocyte infiltration. HA/PLLA screws promote earlier burr hole replacement and have superior biocompatibility compared to PLLA screws.

Publisher

SAGE Publications

Subject

Biomedical Engineering,Biomaterials

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