What is causing my ball joints to wear out every year?

I ve replaced them twice in 2 years, the 1 of them again in less than a year. Less than a year since then they re both making noise again.

Other answer:

What kind of vehicle? You buying cheap crap on line or getting MOOG ball joints with grease fittings that you can lube?
Improper installation.
Mechanics can find out things like that, if you ask them to.
don r:
They must be clean and lubricated and they will last for many years.