Though I 've had the front o/s lower suspension arm and anti-roll bar link rerplaced approx 1 year ago, for several months now, there is a concerning knock that sounds exactly what I experienced before I changed the above components, the sound of a worn ball joint! I've had the front o/s area inspected for movement/play etc by three good indepenent mecahanics and all of them reported no faults and they said it would get through an MoT irrespective ...really. This knock tends to be heard at around 30mph and below when driving on uneven surfaces and it appears to be slowly getting worse.

Can a lower suspension arm become worn in such short period of time but not necessarily show visibly any signs of wear?

For reference, I have also had the upper shocker bearing replaced.

Guys, any thoughts and experiences. Thanks.