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The
Graftech® Difference
The
Graftech® Cervical Spacer, from the makers of Grafton®
DBM, is for the cervical spine surgeon seeking an alternative
to autograft or traditional allograft in their anterior cervical
fusion patients.
Graftech®
Cervical Spacers are produced from select,dense cancellous
tissue, and processed to provide strong, porous structure
that encourages bony ingrowth.
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| Competitive
Comparison
Cortical
bone allografts, such as fibular or humeral cross-sections,
remodel very slowly. In animal studies1, 2 approximately
50% of the cortical bone allografts remodeled, even after
two years post-op, with a mineralized core remaining indefinitely.
- Dense
cancellous bone promotes rapid ingrowth which results in
fixation. Cortical bone does not.
- Consistent
surface area provides maximum graft to endplate interface.
Variable geometry and inconsistent shape do not.
- Infusion
of Grafton® DBM into the porous structure
of the graft creates weight-bearing osteoinductive surfaces.
Cortical bone does not.
- Dense
cancellous bone allows immediate red blood cell saturation
for osteogenesis. Cortical bone does not.
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Allografts
Used in the Cervical Spine
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| Performance |
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Loads
on the Cervical Spine
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STRENGTH
AND APPLIED LOADS ON THE CERVICAL SPINE
Osteotech's
proprietary processing and inspection of the Graftech®
Cervical Spacer results in greater compressive strength than
conventional cancellous bone.3
The Graftech® Cervical Spacer has demonstrated strengths
consistent with loads on the cervical spine, including the
weight of the head, the strength of a motion segment, and
maximum muscular contraction of the cervical spine.3,4,5,6
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Allograft
used in the Cervical Spine
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COMPETITIVE
AND
TRADITIONAL ALLOGRAFTS
The
Graftech®
Cervical Spacer withstands the compressive loads of the cervical
spine, yet has a strength similar to that of a motion segment.
Cortical allografts are significantly stiffer than cervical
endplates, possibly contributing to subsidence into vertebral
bodies.
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Loads
on the Cervical Spine
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GRAFT
/ PLATE LOAD SHARING
When an anterior
plate is used with an interbody graft, the load transmitted
through the graft is 41-53% of the applied load.7,8
Therefore, the load transferred through the Graftech® Cervical
Spacer is significantly reduced when used with a cervical plate.
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Testimonial
"The
Graftech® Cervical Spacer
provides the best surface area contact of any bone graft material
to aid in promoting rapid fixation and then fusion of the ACDF
site."
Fred
H. Geisler, MD, PhD, Chicago Institute of Neurosurgery and Neuroresearch
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References:
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1
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Burchardt,
H.: In Friedlaender, G.E., Mankin, H.J. and Sell, K.W.,
(ed.): Osteochondral Allografts, ed., New York, Little
and Brown, 1981; pp. 51. |
| 2
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Stevenson,
S., Emery, S. E. and Goldberg, V. M.: Factors affecting
bone graft incorporation. Clin. Orthop. Rel. Res.,
(324): 66, 1996.
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| 3
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Data
on file, Osteotech, Inc., Eatontown, NJ |
| 4 |
Choi,
H. and Vanderby, R.: Electromyographic measurement and
analysis of neck loads. 43rd Annual Meeting of the Orthopaedic
Research Society,: 214, 1997. |
| 5 |
Moroney, S. P., Schultz, A. B. and Miller, J. A.: Analysis
and measurement of neck loads. J. Orthop. Res.,
6(5): 713, 1988. |
| 6 |
White
III, A. A. and Panjabi, M. M.: Clinical Biomechanics of
the Spine, 2nd ed. Philadelphia, PA, Lippincott-Raven,
1990, pp 722. |
| 7 |
Frazier,
D., Eismont, F., Milne, E. L., Miller, D. R., Latta, L.
L. and Brown, M. D.: Load sharing characteristics of anterior
cervical plating with plate-to-graft screw fixation. 45th
Annual Meeting of the Orthopaedic Research Society,: 997,
1999. |
| 8
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Rapoff,
A. J., O'Brien, T. J., Ghanayem, A. J., Heisey, D. M.
and Zdeblick, T. A.: Anterior cervical graft and plate
load sharing. J Spinal Disord, 12(1): 45, 1999. |
| 9 |
Smith,
M. D. and Cody, D. D.: Load-bearing capacity of corticocancellous
bone grafts in the spine. J. Bone Joint Surg. [Am.],
75-A(8): 1206, 1993. |
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©
Copyright Osteotech, Inc. 2007. All rights reserved.
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