One of my chicks started walking funny and after inspection it seemed to have an injured knee joint. i read up on some stuff and thought maybe it was a vitamin deficiency. At the time it was the only chick with the problem. even after the medicated water the chick's legs have progressively gotten worse, and now another bird seems to have the affliction. the best way i can describe it is knock kneed. the joints seem swollen and bend at wrong angles(inward instead of back). is this Merak's? i know i will have to put the first out of her misery but am hoping i can save the second. do i need to separate them from the flock?. any and all advice is welcome as i am at my wits end with this. and yes i have tried splinting, manually stretching out the chicks legs and perching them.