Answer:
Netball is a very fast paced sport, with lots of stops and starting whilst the ball is turned over. This puts pressure on the lower joints, such as ankles and knees.
I'm an experienced Netballer that has played for regional teams, so its safe to say I've had my fair share of sprained ankles. I would say that this is were most sprains take place. Whilst running, a quick stop can quite often result in a sprain. Or whilst jumping up to contend for the ball, this happens when you land you may land awkwardly or on another persons foot.
You can also sprain your wrist when you fall over, but this can happen in any case.
I hope that this has been helpful!