The steering is way out of alignment and I hear a grinding?

I hit a curb and damaged and replaced the tie rods. The steering is way out of alignment, and I hear a grinding sound whenever I turn. Now the mechanic is telling me I need to replace the upper control arm and lower ball joint. He didn't say anything about the lower control arm. I'm wondering if this is correct or if I'm just going to have to get him to come back and replace the lower control arm?