There is an interesting study (https://www.theguardian.com/science/2018/jun/14/paws-and-play-gene-treatment-helps-rats-with-spinal-cord-injury-regain-their-nerve) from King's College London suggesting that gene therapy can help restore mobility in the limbs of rats who had had their spinal cords damaged. The single injection delivers an enzyme (chondroitinase) to the damaged region, dissolving scar tissue and allowing the nerves to reconnect. The enabled the rats to regain a complex motor activity task that involved their fore-paws. This may also prove to be helpful in clinically treating some forms of spinal damage.
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