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Cincinnati Sportsmedicine and Orthopaedic Center, University of Cincinnati, Cincinnati, Ohio
Noyes-Giannestras Biomechanics Laboratories, Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, Ohio
Noyes-Giannestras Biomechanics Laboratories, Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, Ohio
Department of Quantitative Analysis and Information Systems, University of Cincinnati, Cincinnati, Ohio
Cincinnati Sportsmedicine and Orthopaedic Center, University of Cincinnati, Cincinnati, Ohio
Cincinnati Sportsmedicine and Orthopaedic Center, University of Cincinnati, Cincinnati, Ohio
We studied posterior cruciate ligament reconstruction in a cadaveric model using two substitutes: a 1-mm diameter flexible cable and an 11-mm diameter Achil les tendon autograft. The thin cable allowed us to study five femoral and five tibial attachments in each knee. A nearly isometric attachment was located after cutting the posterior cruciate ligament while the tibia was re duced with a 100 N anterior force. The five femoral locations studied were the isometric location and four locations centered around this isometric point. The Achilles tendon reconstruction was used with both an isometric and a nonisometric femoral site, allowing us to confirm the results with the wire cable. Posterior motion limits were measured under a 100 N posterior force in the intact, posterior cruciate ligament-deficient, and posterior cruciate ligament-reconstructed knees. We found that the restoration of knee stability in flexion depended strongly on the femoral attachment location. A femoral attachment that was nonisometric by intra operative measurement, but within the posterior cruci ate ligament anatomic footprint, most closely repro duced the intact knee's posterior motion limits. Variations in the tibial attachment site produced only minor changes in the posterior motion limits. We con cluded that the proximal-distal location selected for the femoral attachment of a posterior cruciate ligament substitute was particularly important in the restoration of normal posterior motion limits.
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