ヒト正常前十字靱帯と再建前十字靱帯の変形挙動比較

抄録

In the present study, the strain behavior of the native and the reconstructed ACLs in response to anterior drawer force was determined for assessment of the ACL reconstruction. Anterior drawer force up to 100 N was applied to native (n=10) and the reconstructed (n=5) knee joints at full extension, 30 and 60 degree of flexion using custom made 6-DOF robotic system. A novel three dimensional analysis, we call rotational stereo imaging method, was used for calculation of the strain distribution of both the ACLs. Result revealed that the tensile strains were larger in the ACL attachment area than in the mid-substance at full extension both the ACLs. In knee flexion, strains were decreased in the posterior fiber and increased in the anterior fibers in the native ACL. In contrast, strains were equally increased in the anterior and posterior fibers in the reconstructed ACL. In addition, averaged length change of the fibers was larger in the native ACL than in the reconstructed ACL. While native ACL attaches to the femoral and tibial bone surface through several tissue layers, reconstructed ACL attaches directly to the inner surface of those bone tunnels. Therefore, load transmission pattern maybe different between the native and reconstructed ACLs, which probably resulted in the difference of the deformation behavior between the native and reconstructed ACLs in knee flexion.