Slipped tendon? Please help!

[Birdmansion]

Hi! I need help concerning the chick on the left. She is a day old, and she has her leg back. She can sit like a normal chick if you pick her up and put her in your hand, but when you put her down, her leg keeps going backwards. She also has trouble moving around.

I have no idea what this is and how to treat it. This has never happened before.
I looked it up, and it seems like slipped tendon, but she has also been this way practically since she hatched.
If it is slipped tendon, can anyone who treated it successfully, give me any directions?

 

[Birdmansion]

Please help!

 

[Birdmansion]

It hasn’t been 24 hours yet, but it will be soon.
And I really want to help her before it’s too late.

 

[Eggcessive]

This link might help:
http://bcpoultryhobbyfarmingnetwork.weebly.com/fix-slipped-tendon.html

Here is a video on putting a tendon back into place:

 

[Eggcessive]

This older link below is one that gives instruction on how to determine if the tendon is slipped and how to fix it:
https://www.chickenheavenonearth.co...u-can-do-to-help-chicken-heaven-on-earth.html