If you can't go a year or more without spraining your ankle it is considered to be permanent ankle instability. Alone that would be bad enough but couples with rsd/crps or trouble with both ankles can definitely lead you to be dependent on walking devices or if extreme confined to a wheelchair. My advice is to avoid spraining your ankle for a year or more, pour yourself in to physical therapy, work it as much as you can, rest it whenever you need to. goodluck!