User blog comment:Legionwrex/Why Destroy is the worst ending (besides refusal)./@comment-122.151.64.173-20120814125342/@comment-3258762-20120814185009

Garrus' face when he took the rocket: docs had to resort to surgery and cybernetics as a quick fix

Yes. A quick fix. Like a bandage on a broken leg: You don't keep the bandage on the leg, you have it to keep it from being further damaged so you can get proper medical help. The cybernetics were probably removed when he had access to a proper medical treatment and when the priority was not to make sure he survives.