Without coming off as an a$$, and with all due respect to those who play, golfers aren't exactly running the bases or hurdling defenders. Of course, lower legs (the entire body for that matter) are important to any sport, but clearly to a lesser extent in golf.
Based on reports I've seen, Tiger will certainly need rehab, but will definitely NOT be wheelchair bound and should recover go back to everyday activates again. This, assuming he wants to go thru the rehab, train, etc to get back to physical condition.
If he does opt to play down the road, the challenging part for him could be the pain he will endure on his feet for hours and having to walk all 18 holes. Forgive me for not knowing if golf carts are allowed on the PGA, but would hope Tiger has that luxury WHEN he does return.
Again, let me remind you, this man is one of the greatest competitors ever. TIGER WILL BE BACK.