My 16-week-old rooster, Snowy, can't bend his left leg at all and has a lot of difficulty walking due to it. That leg is not directly underneath him but rather touching the ground diagonally. When he tries to walk the foot on that leg prevents him from stepping forwards. However, he can still support his weight on it if he is able to balance. Sort of like this: Ever since we got him two months ago, he has almost always slept with that leg in front, meaning that he was not sitting on both feet like normal chickens. It has now progressed to the point where my mother is thinking that culling might be necessary. I will be posting a video of him soon to help diagnose him.