Originally Posted by
midlevels
That's correct but if the OP has a a leg problem I'm not sure what benefit a second Y seat would provide as the legroom does not change.
The OP's girlfriend might benefit from some extra "stretching space" if the next seat is empty - she can stretch her affected leg sideways (which I find quite nice when I'm in Y - having rather short legs myself), or she can place a bag under the seat next to her and use it as a foot rest.
As far as I know (me being no orthopaedic surgeon
), ankle "sprains" usually heal in a few weeks? A sprain lasting "2-3 months" sounds like something more serious.
And since the injury is an "ankle sprain", my assumption is that she probably doesn't need to stretch her legs fully straight?