its probable that your sensor got damaged at the same time, after all its a piece of precision equipment that wasnt designed for hard knocks. hope it was repaired well!
i dropped my 28-85mm minolta (lens only) with f/b caps on recently. you could imagine my heart shatter with the same 'clink clink clink' sound of the stainless steel hitting the ceramic tiles on my floor. but....
not only was there ZERO damage cosmetically, there was also no performance problems! aperture blades were snappy, focus ring was tight as its supposed to be, and instead it became sharper. -____- i dont suggest you try it on your 25 year old minolta lenses though!