However , our visual impression of when knee extension began took precedence over any arbitrary position of the knees relative to each other .
It usually corresponded to the point where the knee of the unloaded leg passed behind the knee of the gliding leg .
Our visual impression of when knee extension began took precedence over any arbitrary position of the knees relative to each other .
It usually corresponded to the point where the knee of the unloaded leg passed behind the knee of the gliding leg .