Cockatoo with swollen joint

by Holly
(UK)

Hi there, I have a friend who owns a cockatoo and it has a really swollen, hot ankle joint. It has been like this for a week and has been put on various antibiotics and anti inflammatories by his local veterinary surgeon. The swelling hasn't gone down and he really doesn't want to use the foot. It is not broken but we just don't know what could be wrong and were wondering if you could help.