Nice looking sativa, considering what it's been through. When will your local weather demand you harvest 'em? Should be enough time left for healing, more vegetative growth, and flowering, I'd think...depending on the strain's normal length of flowering.
It won't re-grow the missing parts, but they will be replaced with other growth. The side branches will become the new cola's, and they'll usually compete to be the mainstem. (the tallest shoot)
Roots grow back quickly, especially with some TLC. Not something I'd worry about, and there's nothing you can do about it anyway.
Avoid splashing water and mud on the injuries. (bacteria and such)

Like already mentioned, watch for nanners. Pluck 'em if you find 'em.

Keep your fingers crossed. :thumbsup: