The effect of rearfoot movement on the knee
The purpose of this study was to determine the effect of a lateral and a medial wedge on subtalar joint movement, knee joint valgus/varus angles and knee Q angle alignment. The participants in the study included three male high school athletes (mean age 13.3 years). The knee Q angle of each subject was assessed under three experimental conditions, no wedge, medial wedge, and lateral wedge. In addition, the subjects were filmed while running on a treadmill at 26.8 m/s (6.0 mph) under each of the experimental conditions. All subjects were tested wearing identical BGPRO running shoes and identical 1/4 in. medial or lateral wedges running the length of the shoe. Two high speed Locam cameras, filming at 100 frames/second, were used to film the posterior frontal plane movement of the subjects. Knee Q angle was determined from 35 mm stationary photography. The results of this study indicated that medial and lateral wedge conditions did not significantly effect a change in knee Q angle, running subtalar angle, hip angle to center of gravity, knee angle to center of gravity, the horizontal distance between knee and center of gravity, the horizontal distance between heel and center of gravity, and the distance between consecutive foot strikes between subjects.