Defintely let a shop check it out. The LS is a unibody, no frame. If you took a hit hard enough right on the wheel to break a control arm it could very well have warped the body. It's probably fixable (frame/unibody machines have come a long way) but if you start making repairs yourself and later find that it's more than you can handle, you're boned. I assume that you have the tag number and driver's information of the guy that hit you since you know he's uninsured. My insurance company won't charge the deductible or ding my insurance rate so long as I can give them that information as I found out when my LS was damaged by a tractor trailer leaf spring that broke and tagged the passenger side front of my car.