Get a therapist/physio to strap it properly if you don't know how to do it yourself. Those hedgehogs are great, work yr ankle/lower leg in a more focussed way than balance boards IMO. build up to doing 1 leg balances with eyes closed (tho make sure a wall is close by to steady yourself on!!). Most importantly, when you feel yr ankles are stonger/fully recovered, don't stop the balance/strengthening exercises - you need to do them all the time to keep the strength and proprioception in good order.