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Published in: Clinical Orthopaedics and Related Research® 12/2009

01-12-2009 | Symposium: Tribute to Dr. Marshall Urist: Musculoskeletal Growth Factors

OP-1 Augments Glucocorticoid-inhibited Fracture Healing in a Rat Fracture Model

Authors: Robert S. Gilley, DVM, PhD, DACVS, Larry J. Wallace, DVM, MS, DACVS, Craig A. Bourgeault, BS, Louis S. Kidder, PhD, Joan E. Bechtold, PhD

Published in: Clinical Orthopaedics and Related Research® | Issue 12/2009

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Abstract

Glucocorticoids inhibit bone remodeling and fracture healing. We sought to determine whether osteogenic protein 1 (OP-1) can overcome this inhibition in a closed fracture model in the rat. Time-released prednisolone or placebo pellets were implanted subcutaneously; closed femoral fractures were created 2 weeks later in rats. Fractures received sham, OP-1 and collagen, or collagen-only implants. Femurs were harvested at 3, 10, 21, 28, and 42 days postfracture. Fractures were examined radiographically for amount of hard callus; mechanically for torque and stiffness (also expressed as a percentage of the contralateral intact femur); and histomorphometrically for amount of cartilaginous and noncartilaginous soft callus, hard callus, and total callus. Glucocorticoid administration inhibited fracture healing. The application of a devitalized Type I collagen matrix mitigated the inhibitory effects of prednisolone on fracture healing However, further increases in indices of fracture healing were observed when OP-1 was added to the collagen matrix compared with collagen alone. OP-1 and collagen was more effective than collagen alone.
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Metadata
Title
OP-1 Augments Glucocorticoid-inhibited Fracture Healing in a Rat Fracture Model
Authors
Robert S. Gilley, DVM, PhD, DACVS
Larry J. Wallace, DVM, MS, DACVS
Craig A. Bourgeault, BS
Louis S. Kidder, PhD
Joan E. Bechtold, PhD
Publication date
01-12-2009
Publisher
Springer-Verlag
Published in
Clinical Orthopaedics and Related Research® / Issue 12/2009
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI
https://doi.org/10.1007/s11999-009-0782-1

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