Unable to bend leg and a lump on joint

[RJM]

 

[Kiki]

Welcome to BYC.
Was this chick dropped?
Did you hatch it?

 

[RJM]

No but had trouble hatching so I did assist a little bit by just opening a bit of shell, was hatched in an incubator. Other hatched ok

 

[Eggcessive]

It may have a slipped tendon. Those are seldom treated successfully, but most people try B complex vitamins or a chick vitamin that includes riboflavin. Poultry Cell has some, but Nutridrench does not. Then you can try some splinting if that doesn’t help. Apply a dab of antibiotic ointment to the leg sore. Here is a good thread to read starting at post 12:
https://www.backyardchickens.com/threads/peachick-with-slipped-tendon.1092979/page-2