Deformed feet/legs in keets

[TarheelBirdy]

I apologize, as I am sure that this has been addressed on other posts here, I just couldn't locate them.

A couple of my keets have had deformed feet. They are fully formed, but just sort of roll inward and under. I was able to correct them with little shoes. I was wondering what causes this?

 

[SuperPeacockman]

Quote:
The birds tendons begin to harden once the chick starts breathing air, and the feet are in that position in the egg so if the keet is in the egg to long to tendons will harden into that shape. At least that is what I have been told.