What could be wrong with this hen's feet?

[OptionC]

The hen walks stiffly and her feet look somewhat knotty. She can climb up to the roost, but doesn't like jumping down, which suggests that her feet are in pain. She's about 3 years old, and first started noticeably having trouble with her legs/feet at about 1 and 1/2 - 2 years of age.

The rooster that was likely her father developed a condition very similar to hers that worsened over his life, so there's a possibility that this is hereditary. She's currently the only chicken in the pen with this issue.

Below are pictures of her feet and a video of her walking:

Thanks for any replies.

 

[Eggcessive]

It could be mycoplasma synovitis (MS) a bacterial joint infection. There also looks like a possible bumblefoot scab on the the footpad. MS usually causes swollen hock joints as well, so can you look at her hocks? Does she roost okay, or does she have trouble getting up to the roost? Here is some reading about MS:
https://www.merckvetmanual.com/poultry/mycoplasmosis/mycoplasma-synoviae-infection-in-poultry

 

[OptionC]

It could be mycoplasma synovitis (MS) a bacterial joint infection. There also looks like a possible bumblefoot scab on the the footpad. MS usually causes swollen hock joints as well, so can you look at her hocks? Does she roost okay, or does she have trouble getting up to the roost? Here is some reading about MS:
https://www.merckvetmanual.com/poultry/mycoplasmosis/mycoplasma-synoviae-infection-in-poultry

Thank you. The thing that looks like a scab here is likely just dirt. Her hocks are not swollen. I think she does have some trouble getting up to the roost.

 

[hayley3]

Looks like bumblefoot from the swollen pad but both her feet/toes also look swollen and scaley/flakey. I would wash her feet to make sure that dark spot is dirt. I never look at my chicken's feet..I should do that.

Oh forgot to say...my duck only had the swollen pad...if he had the dark spot it was minimal, yet he died from bumblefoot, even being under a Vet's care.

 

[Eggcessive]

I still think that MS or another bacterial infection might still be the cause of the swollen ankles. Staph, E.coli, and other fecal bacteria are sometimes responsible. Sometimes it is viral. It is diffcult to treat with antibiotics, and the chicken can live for years with MS. If antibiotics are something you want to try, the tetracyclines, tylosin, and Baytril are some that might treat it. Baytril is not approved for poultry and the egg withdrawal time is unknown. For a staph infection, amoxicillin or Baytril would work. Here is some reading about bacterial arthritis and some of the bacteria and viruses that can be a cause:
https://thepoultrysite.com/disease-guide/staphylococcosis-staphylococcal-arthritis-bumble-foot
https://pdfs.semanticscholar.org/0010/eb1737ab822ada14a6823f6e2646798a6b47.pdf