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01-08-2006 | Original Article

Osseous integration of calcium phosphate in osteoporotic vertebral fractures after kyphoplasty: initial results from a clinical and experimental pilot study

Authors: M. Libicher, J. Hillmeier, U. Liegibel, U. Sommer, W. Pyerin, M. Vetter, H.-P. Meinzer, I. Grafe, P. Meeder, G. Nöldge, P. Nawroth, C. Kasperk

Published in: Osteoporosis International | Issue 8/2006

Abstract

Introduction

This study evaluated the radiological changes at the bone–cement interface of calcium phosphate cement (CPC) and polymethylmethacrylate (PMMA) 12 months after kyphoplasty. In a pilot experiment, we additionally performed a histomorphometric analysis in osteopenic foxhounds to analyze the process of osseous integration of CPC and PMMA.

Methods

Twenty postmenopausal female patients with 46 vertebral compression fractures (VCF) were treated by kyphoplasty, utilizing CPC (N=28) or PMMA (N=18) for intravertebral stabilization. After a 12-month follow-up, we measured the density changes of border voxels at the bone–cement interface by computed tomography (CT) using dedicated software algorithms. We defined the border-voxel density (BVD) as a parameter of cement resorption at the interface. We also investigated the bone–implant interface in three osteopenic foxhounds by histomorphometry 3, 6, and 12 months after cement implantation.

Results

Twelve months after kyphoplasty, only CPC showed a significant decrease of the BVD compared to PMMA (p<0.01), indicating a slow progress of resorption at the interface. Histomorphometry of the dog vertebrae showed near total bone coverage of CPC implants, whereas the PMMA surface exhibited only 30% direct bone contact (p<0.01). We also observed a time-dependent increase in the number of discernable osteons close to the interface of CPC, but no bone tissue within PMMA (p<0.01).

Conclusions

The decrease of the BVD 12 months after kyphoplasty may indicate osseous integration of CPC by: (1) the ingrowth of bone tissue and (2) osteonal penetration close to the interface.

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Title: Osseous integration of calcium phosphate in osteoporotic vertebral fractures after kyphoplasty: initial results from a clinical and experimental pilot study
Authors: M. Libicher
J. Hillmeier
U. Liegibel
U. Sommer
W. Pyerin
M. Vetter
H.-P. Meinzer
I. Grafe
P. Meeder
G. Nöldge
P. Nawroth
C. Kasperk
Publication date: 01-08-2006
Publisher: Springer-Verlag
Published in: Osteoporosis International / Issue 8/2006
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-006-0128-8

At a glance: The STEP trials

Springer Medicine

Osseous integration of calcium phosphate in osteoporotic vertebral fractures after kyphoplasty: initial results from a clinical and experimental pilot study

Abstract

Introduction

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Introduction

Methods

Results

Conclusions

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