I can see no compelling reason why a physically disabled person shouldn't be allowed to have a child. If they think that they are able to take care of the child, then they should have one and make that decision for themselves. It's dangerous territory when we start telling certain groups that they shouldn't have the freedom everyone else has.
I feel that any person who has a physical disability which in a the case of a female, would allow her to have a healthy pregnancy and delivery and to care for the child they should absolutely be given that opportunity, Any adult who has learned to accept and build their life around a physical disability would be an extraordinary role model for any child. I do not believe it is not the right of the government or general public to determine a persons right to procreate. If it's meant to be who are we to question?
Think about it, you are bringing a child into the world that could suffer their whole life from that physical condition and be in pain for their entire life. Now if the condition isn't too serious, then yes. Remember, they can still adopt! I'm only writing this last sentence because I need to full fill the word count.