Human Patellar Tendon Strain: A Noninvasive, In Vivo Study

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This study showed the assumption of patellar tendon inextensibility was not valid, and the strain in the patellar tendon was higher than previously reported for other human tendons. The in vivo three-dimensional velocity profiles for the patella, femur, and tibia were measured noninvasively in 18 healthy knees during a low load extensor task using cine phase contrast magnetic resonance imaging. These data were used to calculate patellar tendon elongation and strain. Average maximum strains of 6.6% were found for a low load extension task at relatively small knee angles.

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