I sprained my knee about a week ago during a soccer game. i can now "walk" on it. am i hurting it more trying to walk on it? whwn can i get off of the crutches?

Hard to say: It is hard to say, simply because the specific nature of the injury is not known. Some people might think they had sprained their knee and actually had a major ligament injury to the ACL for example, or others might have truly had a mild injury. As you get more comfortable, it is not unreasonable to progress your weight bearing as tolerated, if any question I would be seen.