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The Effect of Initial Graft Tension in Anterior Cruciate Ligament Reconstruction on the Mechanical Behaviors of the Femur-Graft-Tibia Complex During Cyclic Loading

Hironori Numazaki, MD, PhD^,, Harukazu Tohyama, MD, PhD^,, Hideaki Nakano, MD, Shinichi Kikuchi, MD, PhD and Kazunori Yasuda, MD, PhD

Division of Medical Bioengineering & Sports Medicine, the Department of Advanced Surgery, Hokkaido University School of Medicine, Sapporo
Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan

Presented at the 26th annual meeting of the AOSSM, Sun Valley, Idaho, June 2000.

Address correspondence and reprint requests to Harukazu Tohyama, MD, PhD, Division of Medical Bioengineering & Sports Medicine, Department of Advanced Surgery, Hokkaido University School of Medicine, Kita-ku Kita-15 Nishi-7, Sapporo 060-8638, Japan

Background: Initial graft tension influences clinical results of anterior cruciate ligament reconstruction.

Hypothesis: Under repetitive loading conditions, the effect of initial graft tension on the biomechanical behavior of the femur-graft-tibia complex may depend on the graft and the fixation.

Study Design: Ex vivo biomechanical laboratory study.

Methods: After anterior cruciate ligament reconstruction, initial graft tension of 20, 80, or 140 N was applied to the complex for 2 minutes. Then, a cyclic force-relaxation test was performed for 5000 cycles so that the graft was stretched by 2 mm.

Results: In a patellar tendon graft with interference screws, the average peak load values at the 5000th cycle were 105, 157, and 205 N for the complexes with initial tension of 20, 80, and 140 N, respectively. In a flexor tendon graft with interference screws, the values were 27, 41, and 39 N. In a flexor tendon graft with Endobutton fixation, the values were 17, 40, and 77 N.

Conclusions: Considering the tension of the normal anterior cruciate ligament (16 to 87 N), an initial tension of 20 N appears to be high enough for a patellar tendon graft. For a flexor tendon graft with interference screws, an increase in initial tension above 80 N has no biomechanical advantages.

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