Well, for stems cells to 'grow' into an organ, eg. kidney you need to send the correct signals to stems cells, which are undifferentiated, which can be obtain from the umbilical cord. So far its the part of sending the signal to the cells which is the main problem.

Cloning somebody like you, eg. use the same cloning method as dolly. Will most probably not yield any result if your condition is genetic. Because the same failures will most probably occur in the clone.


Now to the topic of cloning limbs and the reason i think the reason that we cannot 'regrow' our limbs is because out skin is one of the few specialized stem cells that can keep dividing. So since our bone, muscle cells cannot do this, the skin just multiplies and covers the wound, thus scarring. Its interesting to note that the salamander still has stem cells in adulthood and since we can't store stem cells so maybe we shouldn't think of 'regrowing' limbs....

*Interesting thought: why did I write this? it has nothing to do with replacing a kidney damaged by diseases due to diabetics.....*

But if its like an organ like the heart and you need to replace it, then you probably can't use it.