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The mechanical properties of patellar tendons and anterior cruciate ligaments were in vivo evaluated in twelve male subjects. The deformation of patellar tendons was measured during isometric knee extension contractions using ultrasonography. The stiffness, cross-sectional area, and tangent modulus of the patellar tendons were positively correlated with the maximum quadriceps strength. The anterior displacement of tibiae was measured during the anterior drawer of the tibiae. There was no significant correlation between the anterior displacement and the maximum quadriceps strength. These results indicated that the stiffness, cross-sectional area, and tangent modulus of the patellar tendons were larger in the subjects with the larger quadriceps strength but the stiffness of the anterior cruciate ligaments was constant.

Relationships between the Quadriceps Strength and the Mechanical Properties of Patellar Tendons and Anterior Cruciate Ligaments in Humans