2005 Toyota Camry 2005 Camary- Thumping in wheel

For 4 1/2yrs I've had this thumping noise in the front right of my car especially while turning. It has been examined by Toyota service department and all was clear (so they said). Recently I found a mechanic who checked it out completely and thought it was right transaxle. It was replaced and the sound is still there. The entire front end has been checked and the noise is still there. Please give me some suggestions as to what this may be.