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I've never heard of a leg going numb either. That sounds strange, but my right hand had a spot that would go numb during races back in the day. It was always the same spot and only during races, never hard workouts. You'd feel the lactic acid buildup if blood vessels were getting pinched shut. It could just be one of those things.
As far as runners knee, the only answers are ice, ice, ice and stretch, stretch, stretch. You're not doing any actual damage to the connective tissue, but it's irritated. Taking time off will help that irritation go down, but it has to be a pretty significant amount of time to make it go away altogether. Building up the muscles around the area is actually counterproductive since that stronger muscles tend to be shorter and stretch the inflamed tissue even farther. Make sure that you ice after every run and spend 5 or 10 minutes before and (more importantly) after every run stretching it out. Don't neglect the other leg.
And Carn is right that you need to make sure that you have the right shoes. Make sure to ask what sort of mileage they can take, and then stick with it. Rotating shoes will help out too.
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