Hello, I'm trying to figure out what is happening with my flock and why. Three times in the last year I have had a perfectly healthy chicken start limping and then progressively get worse, with one seemingly bad leg. The chicken will limp worse and worse, then eventually try to hop on one leg, and then be totally immobile with that leg jutting out in front, or stiffly to the side. See pictures. We have brought the injured chickens food and water, because they're not able to get to it, But none of them have recovered and they eventually died. Is this slipped tendon? Why has it happened already three times? Is this something to do with our chicken coop? I took as many pictures as I could to show the injured chicken with the leg jutting out in front, and pictures of the coop inside and out. The coop is about a 5' x 4' x 5' box with three roosting posts inside that are about a one and a half inch caliper round post. We use fresh dry straw for bedding. All opinions appreciated.