2 weeks old chick lost use of leg

[SaerJones]

Hi, can anyone help me determine what is wrong with my chick please? It was fine last night but when I checked them this morning, it has lost the use of its leg. It has been hopping around but can't seem to put any weight on its leg at all. Chick is eating and drinking OK and isn't lethargic at all, it is just the mobility.
When this chick first hatched, it did seem to have an issue with the same leg, but after a couple of days of "physio", it seemed to regain use and has been OK up until today.
I've added a video which shows the way it is holding its leg. I've tried to make a support as it's leg was going to the side when it was laid down
First time dealing with anything like this so any help/ thoughts are welcome

 

[SaerJones]

Can't get video to upload, pics will have to do

 

[Eggcessive]

Can you get a picture of the legs while standing from the front or back if you hold it up? Is there a sore on the hock? It could be an injury, a slipped tendon, or a leg bone deformity, such as varus or valgus. Can you treat it with some human vitamin B complex daily, 1/4 tablet crushed in a spoonful of water? Is it getting enough to eat and drink?

 

[SaerJones]

Can you get a picture of the legs while standing from the front or back if you hold it up? Is there a sore on the hock? It could be an injury, a slipped tendon, or a leg bone deformity, such as varus or valgus. Can you treat it with some human vitamin B complex daily, 1/4 tablet crushed in a spoonful of water? Is it getting enough to eat and drink?

It's eating chick crumb and scrambled egg and drinking well and I've put it into a separate brooder by itself. I can't see any sign of sores or obvious injury. The chick holds the leg up when it is standing or rests it on the joint. Not sure if pics are clear enough. I haven't tried the vit B but do have some so will give it ago