If they have splayed lags you can "splint" them by putting a plaster (just anormal Elastoplast Fabric one), cut narrow strip, tape one sticky end round one leg, other sticky end round the other, so legs can't go splat again. After a few days they should be ok, if not you would have to put them down, as tey wouldn't be able to move around. But we have had a couple of those on our last two batches, and they have survived and done very well indeed.