I think the point was that you cant compare the 2 angles if they are measured in different ways, if she is in one position with a leg more extended and he is in another with a flat foot discussing the affect that a 10 degree difference in the angle has on the setup or position is clearly pointless as you are not comparing apples and apples.
That combined with the fact that you cant isolate the exact location of the various joints probably makes discussing angles of +/- 5 or more degrees fairly difficult. What you could do is overlay one print out over the other to see how they compare though in terms of relative position.
That combined with the fact that you cant isolate the exact location of the various joints probably makes discussing angles of +/- 5 or more degrees fairly difficult. What you could do is overlay one print out over the other to see how they compare though in terms of relative position.