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Department of Surgery, University of Tampere and Tampere University Hospital, Tampere
Jyväskylä Central Hospital, Department of Surgery, Jyväskylä
|| Accident and Trauma Research Center and Tampere Research Center of Sports Medicine, Urho Kaleva Kekkonen Institute for Health Promotion Research, Tampere, Finland
Presented at the interim meeting of the AOSSM, San Francisco, California, March 2001.
Address correspondence and reprint requests to Teppo L. N. Järvinen, MD, PhD, Department of Surgery, University of Tampere, 33 014 University of Tampere, Tampere, Finland
Background: Tibial fixation is more problematic than femoral fixation in anterior cruciate ligament reconstruction.
Hypothesis: There is no difference in initial fixation strength among hamstring tendon graft tibial fixation devices.
Study Design: Randomized experimental study.
Methods: Each of six devices used to fix 120 quadrupled human semitendinosus-gracilis tendon grafts into porcine tibiae was tested 10 times with a single-cycle load-to-failure test and 10 times with a 1500-cycle loading test. Specimens surviving cyclic loading were subjected to a single-cycle load-to-failure test.
Results: Intrafix (1332 N) was the strongest in the single-cycle load-to-failure test, followed by WasherLoc (975 N), tandem spiked washer (769 N), SmartScrew ACL (665 N), BioScrew (612 N), and SoftSilk (471 N). After cyclic-loading tests, Intrafix showed the lowest residual displacement (1.5 mm) and was also strongest (1309 N) in the single-cycle load-to-failure test after the cyclic-loading test, followed by WasherLoc (3.2 mm; 917 N).
Conclusion: The Intrafix provided clearly superior strength in the fixation of hamstring tendon grafts to the tibial drill hole.
Clinical Relevance: Some caution may be warranted when using the implants that showed increased residual displacement, especially if aggressive rehabilitation is to be used. Preconditioning of the hamstring tendon graft-implant complex before tibial fixation is needed.
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