A question about wolverine

So after watching wolverine this summer and rewatching origins I have a question for our comic book guys. Why, when they were coated with adamantium, did Logan's claws all of a sudden get polished, sharpenned, and regular. Since Stryker just injected his bones and didn't do any implanting of original parts shouldn't the metal claws have been the same shape and form of the original spike like bone protuberances? Why did they go from irregular lumpy spikes shapes to smooth curved knives? And then go back to lumpy bumpy bone again.