Each hub sits on a ball joint, secured by 2 bolts to the hub and 1 nut to the lower arm, this is the case on each corner.

With a completey knackered ball joint you will be able to find some

"play" in the joint by leavering the hub and lower arm apart with a leaver bar.

If you push your finger into the rubber boot part of the ball joint and leaver the hub and lower arm apart you will feel some

"play"

Where a ball joint is worn but not excessive you will not feel anything, this does not mean its ok.

On a 2 poster ramp or by jacking the car up the suspension pushes the hub into a un-natural road going position which pushes the ball joint together and making it harder to find

"play"

A good ball joint will be very difficult to rotate by hand

(if it were in you hand) so if your not sure get it out and check it.

You have to image that with the cas weight sitting on the ball joint there would be very much more

"play"

Alot of poor driving

"feel" is created by ageing ball joints and often over looked because its can be difficult to diagnose.

The other possibility will be the wheel bearings/discs/track rod ends and even top mounts which are very much easier to check, let us know if you not sure.

James