Looks more like cordyline than Yucca, with that long woody stem. Any sign of insect infestation, or yellow mottling anywhere? If not, this could just be a result of the harsh winter.

Can't see any insect infestation, but has been suffering from Yellow mottling?
What causes this? Thanks.

Virus, usually, though not always, need to see the yellow mottling to be sure, but the distorted leaves are a sign of possible virus infection. No treatment for it I'm afraid, feed it if you haven't already and it may recover (rather like humans do!)

Thanks Again, Regards.