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The American Journal of Sports Medicine 19:217-225 (1991)
© 1991 SAGE Publications

Tensile properties of the human femur-anterior cruciate ligament-tibia complex

The effects of specimen age and orientation

Savio L.-Y. Woo, PhD

Musculoskeletal Research Laboratories, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania

J. Marcus Hollis, PhD

Musculoskeletal Research Laboratories, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania

Douglas J. Adams, MS

Orthopaedic Bioengineering Laboratory, University of California, San Diego, California

Roger M. Lyon, MD

Orthopaedic Bioengineering Laboratory, University of California, San Diego, California

Shinro Takai, MD

Musculoskeletal Research Laboratories, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania

The structural properties of 27 pairs of human cadaver knees were evaluated. Specimens were equally divided into three groups of nine pairs each based on age: younger (22 to 35 years), middle (40 to 50 years), and older (60 to 97 years). Anterior-posterior displacement tests with the intact knee at 30° and 90° of flexion revealed a significant effect of knee flexion angle, but not of specimen age. Tensile tests of the femur-ACL- tibia complex were performed at 30° of knee flexion with the ACL aligned vertically along the direction of applied tensile load. One knee from each pair was oriented anatomically (anatomical orientation), and the contralateral knee was oriented with the tibia aligned vertically (tibial orientation). Structural properties of the femur-ACL-tibia complex, as represented by the linear stiffness, ultimate load, and energy absorbed, were found to decrease significantly with specimen age and were also found to have higher values in specimens tested in the anatomical orientation. In the younger specimens, linear stiffness (242 ± 28 N/mm) and ulti mate load (2160 ± 157 N) values found when the femur- ACL-tibia complex was tested in the anatomical orien tation were higher than those reported previously in the literature. These values provide new baseline data for the design and selection of grafts for ACL replacement in an attempt to reproduce normal knee kinematics.




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