strut replacement

What is your question?

I hired a private mechanic to replace my struts (front and rear. When I got my car I noticed that when I turn the steering wheel, there is a noise coming from the struts or front wheels. I ignored it but when I was driving downhill on an uneven surface, I heard a loud "thug!" sound from the left front wheel. What could have caused the noises? These didnt happen before I replaced the struts. Thanks and anticipating som advice.