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TECHNICAL PAPERS

Comparison of Viscoelastic, Structural, and Material Properties of Double-Looped Anterior Cruciate Ligament Grafts Made From Bovine Digital Extensor and Human Hamstring Tendons

[+] Author and Article Information
Tammy L. Haut Donahue, Colin Gregersen, M. L. Hull

Biomedical Engineering Program, University of California at Davis, Davis, CA 95616

Stephen M. Howell

Department of Mechanical Engineering and Biomedical Engineering Program, University of California at Davis, Davis, CA 95616

J Biomech Eng 123(2), 162-169 (Oct 01, 2000) (8 pages) doi:10.1115/1.1351889 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

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Figures

Grahic Jump Location
Photograph of a double–looped graft with the sutures attached to each of the four limbs
Grahic Jump Location
Photograph of the test set up illustrating the jig used to equally tension all four limbs of the double–looped graft. The saline bath and the other half of the freeze clamp have been omitted for clarity.
Grahic Jump Location
Plots illustrating the history for the viscoelastic tests over the three-day test period
Grahic Jump Location
Example plot comparing the load-displacement of the bovine and human grafts from the load-to-failure test. Inasmuch as all grafts failed by midsubstance tears, the clamping procedures did not influence the determination of the ultimate load.
Grahic Jump Location
Average and 95 percent confidence limits of the load versus time for double–looped bovine and human tendon grafts in the constant displacement relaxation test with initial strain of 2.5 percent (n=10). After the 15 minute relaxation period, the load difference between the two tendon grafts was not statistically significant (p=0.894).
Grahic Jump Location
Average and 95 percent confidence limits of the residual displacement versus time for double–looped bovine and human tendon grafts in the constant load cyclic creep test (n=10). Following the 15 minute creep period, the difference between the two tendons was not statistically significant (p=0.360).
Grahic Jump Location
Average and 95 percent confidence limits of the creep displacement versus time for double–looped bovine and human tendon grafts in the constant load creep test (n=10). Following the 15 minute creep period, the difference between the two tendons was not statistically significant (p=0.115).
Grahic Jump Location
Average and 95 percent confidence limits of the residual displacement versus time for double–looped bovine and human tendon grafts in the incremental load cyclic creep Test (n=10). Following the creep period, the difference between the two tendons was not statistically significant (p=0.762).

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