Experts and BHG readers answer.
Pruning Silver Lace Vine
How severely were they pruned back? Do you mean that you cut them back so that no leaves remained on the vines, and none sprouted the rest of the year? If so, it's not likely that they'll sprout this spring, but I'd give them another month to 6 weeks just to be certain that they're not dead. Normally silver lace vine is quite vigorous and would resprout from a severe pruning.