3 dat old chick cank walk has lump on knee joint

[Sweet Coastal]

I have a 3 day old easter egger chick who unthought had splayed leg and treated accordingly. Only one leg was out to the side. Today 2 days later he still could not walk. Upon further investigation I realized that his hurt leg has a hard lump at the knee joint. It's about 3 times the size of the other joint. Any suggestions? I have never seen this before.

Pardon the misspelling on my title. It won't let me change it. Lol.
Thanks

 

[Eggcessive]

I think that is probably a slipped tendon which is very hard to do anything about. The swelling is pretty common, and these chicks usually have a leg bone deformity that worsens with age. It is however worth trying to treat with splinting and giving poultry vitamins with trace minerals (something like Poultry Cell or Poultry Nutri-drench 1 ml daily orally.) Here is some reading about slipped tendon--read post #3 for more links:
https://www.backyardchickens.com/t/1036037/is-this-slipped-tendon