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Abstract #1192

Ultra-short Echo Time Magnetic Resonance Imaging of Rabbit Flexor Tendons in An Anterior Cruciate Ligament Reconstruction Model

Sarah L Pownder 1 , Parina Shah 1 , Michael Schaer 2 , Richard Ma 3 , Xiang-Hua Deng 2 , Matthew F Koff 1 , Scott A Rodeo 2,4 , and Hollis G Potter 1

1 MRI, Hospital for Special Surgery, New York, NY, United States, 2 Laboratory for Soft Tissue Research, Hospital for Special Surgery, NY, United States, 3 Missouri Orthopaedic Institute, University of Missouri, Columbia, MO, United States, 4 Sports Medicine and Shoulder Service, Hospital for Special Surgery, NY, United States

Preclinical orthopaedic studies of anterior cruciate ligament reconstruction (ACLR) may allow free cage movement of animals post-operatively. The associated joint loading due to ambulation is a confounding variable that may affect graft healing. Loads which disrupt tendon collagen fibers and alter UTE T2* values have not been established. We developed a low-load rabbit ACLR model by combining unique tunnel position and pretensioning . Similar tendon T2* values were found between mobilized and immobilized rabbits following ACLR. These data demonstrate conditions in which strain is insufficient to alter T2* values, obviating the need for immobilization in this model.

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