Can your tibia go out of place? what is a normal range of motion? when my knee goes straight it is -11 which i know is not good.

No your tibia cannot: Go out of place unless you have a major trauma to your knee. Normal range of motion at your knee is about -5 degrees to 150 it lessens with age and arthritis. Some people can have increased hyper extension in their knee if they are more "stretchy" or double jointed. -11 wouldn't be terribly unusual in somebody that is hyper lax.