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A Comparison of Two Strength-Testing Methodologies for Interbody Structural Allografts for Spinal Fusion / JM. Dawson, SL. Griffith

Conference Author
Spinal Implants: Are We Evaluating Them Appropriately? (2001 : Dallas, Texas)
Physical Description
1 online resource (7 pages) : illustrations, figures, tables
Additional Creators
Griffith, SL., Dawson, JM., American Society for Testing and Materials, and ASTM International
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Summary
To maintain an intervertebral disc space during fusion, a structural allograft, typically utilizing dense cortical bone, must sustain functional loads. Difficulty with surgical placement of structural allografts has resulted in reports of intraoperative graft fracture but no data have been generated to quantify insertional loads. In this study, simulated intraoperative and immediate postoperative strengths of allograft femoral rings were quantified. Three types of processed allograft were used: Tutoplast¿̐ư processed bone, frozen-thawed and freeze-dried. To replicate postoperative in vivo functional loading, axial compressive strengths were evaluated by crushing femoral rings between flat platens under displacement control. To replicate surgical placement into an intervertebral space, samples were oriented so that the ring would be loaded transversely and an ¿̐ưinsertion¿̐ư displacement was imposed at 1m/sec. In axial compression, all three allograft types sustained loads far greater than estimated in vivo spinal loads. In insertion loading, all allograft types yielded substantially smaller strengths. Because intraoperative insertional loads are unknown and subjective to individual surgeon technique, the adequacy or inadequacy of any group is unclear. Testing guidlelines should be developed upon both anticipated in vivo loading and intraoperative demands.
Dates of Publication and/or Sequential Designation
Volume 2003, Issue 1431 (January 2003)
Subject(s)
Other Subject(s)
ISBN
9780803154803 (e-ISBN)
9780803134638
0803134630
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 7.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2003. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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