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Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
Presented at the International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine Biennial Congress, Washington, DC, May 1999, where it won the Albert Trillat Young Investigator Award.
Address correspondence and reprint requests to Savio L-Y. Woo, PhD, Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, E1641 Biomedical Science Tower, 210 Lothrop Street, POB 71199, Pittsburgh, PA 15213
To establish a quantitative biomechanical relationship between the anterior cruciate ligament graft and the medial meniscus, 10 human cadaveric knees were examined using the robotic/universal force-moment sensor testing system. In response to a combined 134-N anterior and 200-N axial compressive tibial load, the resulting kinematics of the knee and the in situ forces in the anterior cruciate ligament, the anterior cruciate ligament graft, and the medial meniscus were measured. Anterior tibial translation significantly increased after anterior cruciate ligament transection, between 6.8 ± 2.3 mm at full extension and 12.6 ± 3.3 mm at 30° of flexion. Consequently, the resultant forces on the medial meniscus, ranging from 52 ± 30 N to 63 ± 51 N between full extension and 90° of knee flexion in the intact knee, were doubled as a result of anterior cruciate ligament deficiency. However, after anterior cruciate ligament reconstruction, anterior tibial translations were restored to the levels of the intact knee, and thus the forces on the medial meniscus were restored as well. Likewise, the in situ forces in the anterior cruciate ligament replacement graft increased between 33% and 50% after medial meniscectomy.
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