hello everybody it was really nice going through all this but i just wanna knw one thing is that y we want that patient to lock his knee coz if we r doing so no muscle activity of quads is seen as the joint is locked but insted we want him to learn to control his knee joint , so we must forget about asking him to lock the knee joint and instead start with eccentric knee extension exercise so that he develops control over his knee , u can start this first in supine lying and then in standing , and is standing we should go for stance training with knee slightly bend rather than knee completely extended that will stress the quads muscle and strengthening will take place.