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The Effect of Cyclic Displacement On the Biomechanical Characteristics of Anterior Cruciate Ligament Reconstructions

Masanori Yamanaka, RPT^,, Kazunori Yasuda, MD, PhD^,, Harukazu Tohyama, MD, PhD, Hideaki Nakano, MD and Tatuhiko Wada, PhD

Department of Medical Bioengineering, Hokkaido University School of Medicine, Sapporo, Japan
Department of Physical Therapy, Hokkaido University College of Medical Technology, Sapporo, Japan

Presented at the 24th annual meeting of the AOSSM, Vancouver, British Columbia, Canada, July 1998.

Address correspondence and reprint requests to Kazunori Yasuda, MD, PhD, Department of Medical Bioengineering, Hokkaido University School of Medicine, Kita-15 Nishi-7, Sapporo, 060-8638, Japan

This study was conducted to clarify the influence of cyclic displacement on the structural properties of four types of femur-graft-tibia complexes used to reconstruct the anterior cruciate ligament. Forty hindlimbs from pigs were used. In two groups, bone-patellar tendon-bone grafts were secured with interference screws (group A) or the suture-post technique (group B). In two groups, multistrand flexor tendons were fixed using the tape-staple technique (group C) or the sutures-tied-over-a-button technique (group D). In each group, five femur-graft-tibia complexes underwent tensile failure tests without cyclic displacement. The other five complexes underwent 5000 cycles of cyclic elongation for 2 mm, and then underwent the tensile failure tests. The initial stiffness significantly decreased after cyclic displacement in each group, although there were no significant differences in the linear stiffness and the ultimate failure load between the tests with and without cyclic displacement. These findings suggest that 5000 cycles of repetitive elongation of the femur-graft-tibia complex by 2 mm does not jeopardize the graft fixed with the procedures used in this study, despite a slight but significant increase of an anterior-posterior laxity of the knee.

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