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* Biomedical Engineering Graduate Group, University of California at Davis, Davis, California
Department of Mechanical Engineering, University of California at Davis, Davis, California
Clinical Investigation Facility, David Grant Medical Center, Travis Air Force Base, California
Address correspondence and reprint requests to LTC Stephen M. Howell, USAFR, MC, 8100 Timberlake Way, Suite F, Sacramento, CA 95823
Background: For a tendon graft to function as an anterior cruciate ligament, the tendon must heal to the bone tunnel. We studied the effect of 4 weeks of implantation on the strength and stiffness of a tendon in a bone tunnel using two different fixation devices in an ovine model.
Hypothesis: The type of fixation device in anterior cruciate ligament reconstruction may affect early healing, which can be measured as the strength and stiffness of a tendon in a bone tunnel.
Study Design: Controlled laboratory study.
Methods: An extraarticular tendon graft reconstruction was performed in ovine tibias. The graft was fixed with either a bioresorbable interference screw or a WasherLoc. After 4 weeks of implantation the strength and stiffness of the complex and the tendon graft-bone tunnel interface were determined by incrementally loading specimens to failure.
Results: For the interference screw, the strength deteriorated 63% and the stiffness deteriorated 40%. For the WasherLoc, the strength was similar and the stiffness improved 136%.
Conclusions: The type of fixation device determines whether the strength and stiffness of a tendon in a bone tunnel increases or decreases after implantation.
Clinical Relevance: The pace of rehabilitation may need to be adjusted based on the type of fixation device used to secure a soft tissue graft.
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