Osteoconductivity of an injectable and bioresorbable poly(propylene glycol-co-fumaric acid) bone cement

We have investigated an injectable form of a resorbable bone cement based on in situ crosslinking of the unsaturated polyester, poly(propylene glycol-co-fumaric acid) (PPF). This material, filled with calcium gluconate/hydroxyapatite (CG/HA), cures to a hard cement degradable by hydrolysis. The purp...

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Bibliographic Details
Published in:Biomaterials 2000-02, Vol.21 (3), p.293-298
Main Authors: Lewandrowski, Kai-Uwe, Gresser, Joseph D, Wise, Donald L, White, Roslyn L, Trantolo, Debra J
Format: Article
Language:English
Subjects:
Animals
Biocompatibility
Biological and medical sciences
Bone cement
Bone Cements
Bone Remodeling
Calcium compounds
Copolymers
Fumarates
Injectable
Male
Medical sciences
Orthopedic surgery
Osteoconductivity
Physiological models
Poly(propylene glycol-co-fumaric acid)
Polyesters
Polypropylenes
Rats
Rats, Sprague-Dawley
Resorbable
Solubility
Surgery
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
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Summary:We have investigated an injectable form of a resorbable bone cement based on in situ crosslinking of the unsaturated polyester, poly(propylene glycol-co-fumaric acid) (PPF). This material, filled with calcium gluconate/hydroxyapatite (CG/HA), cures to a hard cement degradable by hydrolysis. The purpose of this study was to evaluate the osteoconductive properties of this injectable cement. The cement was used as an adjunct to fixation with an intramedullary rod in the rat femoral osteotomy model. Ingrowth of new bone into the cement was examined in vivo. Negative and positive controls with rigid and loose internal fixation were included for comparison. Animals were evaluated histologically and histomorphometrically at 4 weeks postoperatively. Results of this study showed osteoblastic activity and new bone formation at the interface between the femoral bone and the cement in the experimental group. However, there was little bone remodeling at the endosteal surface in positive and negative controls. Histologic evaluation of the cement revealed the formation of cavitations, which likely resulted from leaching of the highly soluble calcium gluconate portion of the filler from the cement. These cavitations were sites of ingrowth of vascular and bony tissues. Intimate contact between the bone cement and the endosteal surface of the cortex was found. Quantitative histomorphometric analysis corroborated these observations. Findings of this study demonstrated the osteoconductivity of this type of injectable PPF-based bone cement.
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(99)00180-5