Most tyre wear problems around 2001 were with the inner edges of the rear tyres if I remember correctly.
Having said that who knows what a knock to a wheel can do to the geometry either front or back. Would have thought that it would depend on the angle and severity of the impact and perhaps the load in the car as to causing wear on inside or outside edge.
But then I am an accountant not a tyre expert. I might be talking complete rubbish. It would'nt be the first time.
And I did say it was only a theory.