HouseCallAuto 1/26/2012It is likely that one or both front drive axles have to be replaced.
HouseCallAuto 1/27/2012Well I can just tell you from experience that this described symptom you detailed; a knocking sound while in a turn, is a classic symptom of a bad outer CV joint on at least one drive axle. If the knocking seems louder while accelerating slightly while still in the turn, it firther confirms the bad CV joint, however, a bad front wheel bearing is also a possibility, but when bearings go bad the described symptom is usually a rubbing sound as soon as the steering wheel is turned slightly (like when changing lanes).
jimmy 1/24/2013I agree with House Call Auto who answered previsously, sounds like cv-axles. Not very difficult, but be careful who you get to repair it. Axles cost from 60-90$ each at autozone, I would suggest replacing both at once, to keep from having to do it again anytime soon.