Contribution of the kinematic chain of pronation-supination of the rearfoot and internal-external rotation of the shank to lateral movement of the knee during early stance

The present study has revealed that the kinetic chain of rearfoot pronation-supination and shank rotation contributes to lateral motion control of the knee during early stance. The subjects were 26 healthy adults. The kinematic chain ratio (conversion rate of shank rotation angle in relation to rearfoot pronation/supination angle) and lower limb motion during gait were measured, and factors influencing the knee adduction angle were investigated by multiple regression analysis. The result showed that smaller the kinetic chain ratio, and greater the rearfoot pronation, greater the knee adduction angle. Also, greater the knee external rotation position and internal rotation movement change, greater the knee adduction movement.