say youre bending the leg, mask all the model but the leg, then draw a transpose line from the shoulder to the hip, then press r (to rotate), hold alt+click drag on the centre of the transpose that's at the hip.. this should act as the ball and socket joint of the leg, then proceed by moving the transpose to the knee, and then the ankle if needed.
then you can smooth out any sketch stretches that happened.
p.s. use the transpose tool at the lowest sub level!!
Edited by MrMatt, 18 March 2012 - 06:43 PM.