Can you use the Monk skill Shadow Step while tied up or with your hands bound to a wall? 

> 
> At 6th level, you gain the ability to step from one shadow
>  into another. When you are in dim light or darkness,
>  as a bonus action you can teleport up to 60 feet to an
>  unoccupied space you can see that is also in dim light
>  or darkness. You then have advantage on the first melee
>  attack you make before the end o f the turn.
> 
> 
> 

As far as I can tell there is no rule that you can't use Shadow Step to get out of that situation.