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Abstract #0309

MRI relaxometry to assess the tension state of the anterior cruciate ligament in vivo

Delphine Perie 1,2 , Simon-Pierre Cot 1,2 , Guillaume Gilbert 3 , Maxime Raison 1,2 , and Guy Grimard 2

1 Mechanical Engineering, Ecole Polytechnique de Montral, Montreal, QC, Canada, 2 Research Center, CHU Sainte Justine, Montreal, QC, Canada, 3 Philips Health Care, Montreal, QC, Canada

While the diagnosis and treatment of a ruptured ACL have been under heavy study for the last decades, the postoperative evaluation is still performed using qualitative methods. Eight healthy volunteers had their left knee imaged using multi-parametric MRI in two positions: in full extension with the ACL under heavy tension, and at 20 degrees of flexion with the ACL nearly at rest. There were significant differences between knee positions for T1rho and T2*, and between subjects for T1rho only. To our knowledge, this study represents the first attempt to assess directly in vivo the tension state of the ACL. T1rho seems to be a good indicator of the tension state within the ACL.

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