Motorized Wheel Chair Source

Stem Cell research (which is what I presume you mean when you say cloning) is pushing back the boundaries of science yes, but I doubt they will ever be able to replace the spinal cord, as when it comes to replacement cells they are difficult as they pertain to motor reactions which we don't fully understand yet, thought that is more a question for a neurologist to answer.

When I was in school, long before I studied medicine our teacher was telling us about how Dick Turpin met his end in York Jail. My question was simple. If hanging a man didn't suffocate them, how did they die? My teacher responded "The nerve that tells the heart and lungs how to function, the medulla oblongata, is located in the bottom half of the brain, so if that is stressed, by say, hanging, it's curtains..." Later on I found that it is connected to the spinal cord and controls the automatic reactions that the body has. Because the spinal cord has it's own "brain" as it were, and there are billions of connections to make one would assume that to replace any part of the spinal cord/column, one would need to replace all of it, and then the cerebral cortex and so on. So I would land on side the side that this is impossible, however, the boundaries of science are being pushed back all the time and it's important to remember that nothing is impossible, that's what being a scientist is all about!