A broken engine mount that allows the engine to rise up from its proper location can be more than an annoyance. In some cases it can make the throttle stick open. Every 20,000 Km your under car inspection should include a check of steering and suspension components. Begin by checking ball joint condition. Cars with upper and lower control arms have both loaded and unloaded ball joints.
Most mechanics check the condition of the loaded joints only.
If these are okay, the unloaded joints should be okay as well. Of course, if the loaded joints have been replaced, they could be in better shape than their weak sisters. The loaded ball joint is the one that carries the spring. If the spring is mounted on the upper control arm, then the upper joint is the loaded joint. If the spring is on the lower control arm, the lower joint is the loaded joint.