Abstract

The relationship between hamstring muscle stiffness and the functional ability level of 17 subjects with complete anterior cruciate ligament rupture confirmed at arthroscopy was examined. The hamstring muscles were modelled as a single degree of freedom mass spring system with a damping component. Using this model the stiffness of these muscles was examined at 30, 45, and 60 of a maximum voluntary isometric muscle action. The functional ability of the subjects, attained using the Noyes knee rating system, was then correlated to muscle stiffness measures. Positive correlations of 0.71, 0.72, and 0.62 at the three respective muscle loading levels were observed. These findings suggested that hamstring muscle stiffness may have an important role to play in the functional ability of subjects with anterior cruciate ligament deficiency. Verf.-Referat