光弾性皮膜法を用いたヒト前十字靱帯のひずみ分布測定(1部生体の計測)

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Understanding what strains occur over the surface area of a ligament is important, in order for the results between specimens or studies to be more reliably compared. To overcome restrictions in existing techniques and enable strain analysis over the whole surface of a ligament, we applied a photoelastic-coating method to the measurement to obtain visualized strains. We tried several photoelastic materials on various ligaments, and tested the reinforcement effect caused by the adhesion, as well as the traceability to the ligament's strain. A specific kind of polyurethane film was found to have negligible effect on the Young's modulus of the ligament. That film showed optically high fringe sensitivity. The isochromatics appearing on it closely reflected the strain behavior of the ligament. Following the above experiments, a direct application of photoelastic coating method to the human ACL was performed. A cadaver knee was fixed to a specially designed device (simulator jig). A three-dimensional displacement and rotation of the knee associated with its flexion-extension were measured with the simulator jig. Next, the medial half of the femur was removed in order for the ACL to be exposed. Free flexion-extension of the knee was reproduced by manipulating the simulator jig even without tibio-femoral articulation. Then variations of strain distribution over the entire surface of the ACL were measured using photoelasticity. The fringes appearing on the ACL were measured to obtain the values and directions of principal strains, and the strain distributions along the principal strain trajectories. Measurement results revealed that the principal strain directions were close to the fiber directions. During knee motion, it was verified that the antero-medial and postero-lateral bundles functioned reciprocally, and a zero strain area was observed on the central/posterior side near the tibial insertion. In general, the strains were rather uniform along the principal strain lines and decreased rapidly near the insertions. Yet strain distribution varied from portion to portion in complex fashion according to knee angle.
バイオメカニズム学会の論文
1998-11-25

光弾性皮膜法を用いたヒト前十字靱帯のひずみ分布測定(1部生体の計測)

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光弾性皮膜法を用いたヒト前十字靱帯のひずみ分布測定(1部 生体の計測)

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光弾性皮膜法を用いたヒト前十字靱帯のひずみ分布測定(1部生体の計測)