Your query says, you have seen an Orthopaedician for the same problem. I hope its treated with a cast or surgery.
Addressing to your worry about growth plate injury
, as you are 14 years old, the amount of expected deformity
or shortening of the leg is very less as your growth will stop at 16 years (average girl) or 18 years (average boy). And the amount of growth occurring at the ankle is far less than what takes place at the ankle. So i am not expecting a major deformity or shortening of your leg.
But you need to visit your orthopaedician at 6 monthly intervals or annually.