He looks thin in the leg that bears the weight. Previous owner must have done something or allowed somethng to happen to right leg. I am betting stag got his leg twisted by being hung or he got handled rough when being captured. If so then damage to joint in hip, knee or heel area likely. Damage in those areas could impact circulation to lower foot where swelling is visible. Overall he looks very underweight with too much skin showing. Does he show worm sign? I would also be concerned about possible past bout with cocci that could keep looked pale like he looks now. Putting him on grass and getting good greens plus quality protein may help get him back into condition. If joint problem hypothesis correct, then he will be frail likely for life in that respect. I could recommend a diet (far from practical) that may speed convalescing. Keep him from jumping or any frightened movements until normal gate restored.i think your right Central i think the problem is higher up but the foot is a problem to he can walk when he needs to i think what might of happened was when i got him he was thin from the pr eves owner so i put him on a tie cord and i remeber one of my stags going over and fighting with him so that could of coursed some damage this bird has just come under my control 2 days ago and seems to be getting better with the antibiotics his face turnes bright red at times and he can walk when he wants to but looks like an old man walking so if its an injury i guess i can deal with that if its say mareks ill have to cull him i hope its not mareks what do you think if your on face book p.m me i have videos on there of him walking....