I read somewhere that playing with 4 fingers can mess up your phalanges (at least I think that's what they are called). The little ligaments you can see through the top of your hand. Anyway, I read that since the middle and ring fingers are connected somehow, using them with the 4 finger technique can be detrimental to your hand. Is this true? I forget where I read it, so please don't ask me where I got this from.