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Osteoporosis International

Erschienen in:

01.03.2014 | Original Article

Production and repair of implant-induced microdamage in the cortical bone of goats after long-term estrogen deficiency

verfasst von: Z. Yu, G. Wang, T. Tang, L. Fu, X. Yu, L. Cao, Z. Zhu, K. Dai, S. Qiu

Erschienen in: Osteoporosis International | Ausgabe 3/2014

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Abstract

Summary

By using an ovariectomized goat model, we found that estrogen depletion decreases bone quality and makes it susceptible to screw-induced mechanical microdamage. Both diffuse microdamage and linear cracks accumulated up to 3 weeks after screw implantation, and the microdamage was repaired gradually after 4–8 months.

Introduction

The aim of this study was to observe the effect of long-term estrogen deficiency on the creation and repair of microdamage in cortical bone adjacent to bone screw.

Methods

Cortical bone screws were placed in the tibial diaphyses 28 months after ovariectomy (OVX) or sham operation (Sham-Op) in female goats. The goats were euthanized at 0 day, 21 days, 4 months, and 8 months after screw implantation. Microdamage morphology and repair were examined in peri-screw bone using histomorphometric method, and the nanomechanical properties of peri-screw bone were examined with nanoindentation testing.

Results

Tibiae from ovariectomized goats in which screws had been placed had significantly higher levels of diffuse microdamage and significantly more linear cracks than those from sham goats, and the diffuse microdamage was more obvious than linear cracks in the region adjacent to the implant. Both diffuse microdamage and linear cracks accumulated up to day 21 and then gradually repaired at 4 and 8 months after surgery. The trend for bone remodeling in each group was consistent with changes in the level of microdamage. Nanoindentation testing showed that both elastic modulus and hardness in peri-screw bone were significantly decreased in OVX group compared to Sham-Op group. The hardness and elastic modulus also showed a downward trend up to 4 months after screw implantation and then exhibited some recovery after 8 months.

Conclusions

Estrogen depletion decreases bone quality and makes it vulnerable to screw-induced mechanical damage, which may compromise the initial stability of an orthopedic implant.

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Titel: Production and repair of implant-induced microdamage in the cortical bone of goats after long-term estrogen deficiency
verfasst von: Z. Yu
G. Wang
T. Tang
L. Fu
X. Yu
L. Cao
Z. Zhu
K. Dai
S. Qiu
Publikationsdatum: 01.03.2014
Verlag: Springer London
Erschienen in: Osteoporosis International / Ausgabe 3/2014
Print ISSN: 0937-941X
Elektronische ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-013-2496-1

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Abstract

Summary

Introduction

Methods

Results

Conclusions

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