The one on the foot won't really deform much, same with the one connecting the knuckles to the hand.
The lower leg ones shouldn't deform much (though slightly more) either. I don't foresee any real problems if the animation is carefully done.
The one in the knee is uncertain. I would try to simpify that part a bit, but it seems like it'd deform more or less correct.
The one on the back will deform beautifully, as it lies on an actual real muscle point, so while it will deform a lot, it'll also look correct.
The shoulder might be problematic, same with the wrist one. I don't see a clear fix for either though.