I think this is an
I think this is an interesting question. I have about a 1 inch or greater leg length discrepancy. It seems to have gotten worse as I've gotten older -- I find it particularly obvious when I wear a belt (I'm a man), as it highlights the difference.
I haven't looked in the scientific literature to see whether there's any link between LLD and running injury, but I suspect it might have played a role in my numerous injuries during my shod days.
I also think my LLD has made barefoot running more of a challenge than it would be otherwise. My right leg is longer than my left, and all of my hot spots, sensitive/raw/"bruised" spots, and embedded rocks and glass have occurred in my right foot. It's finally getting better now as I am really focusing on bending my knees. But for the past 9 months or so, I've wished I had "two left feet", because if both of my feet were like my left, I'd be running a lot longer, faster, and on rougher surfaces by now. I've tried to have my right foot imitate the left foot in terms of landing and lift off (to steal the secrets of the left foot), and had a little bit of improvement. But the real secret still seems to be to bend the knees.
Does any one else here have a leg length discrepancy have problems more often in one foot or the other? Which foot (on the shorter or longer leg) tends to have more trouble? Most of my problems with the right foot would seem to be due to more pushing off (despite all my efforts otherwise) and/or not relaxing. I wonder whether the foot on the longer leg is more prone to pushing off or is more difficult to relax (psychologically, because of an uneven gait or something).