I know they are unrelated. But did you see what happened to Sebastian deisler. He got injured so many times that he lost faith, and he said in an interview that when you get injured so many times you legs shake when you are in the field and there is a fear factor which enters your mind. It prevents you from getting stuck in or making tackles. Hence he retired at the age of 27 (For me he was the most naturally talented and skilled player
).
OK now saying that I don't understand what the fuss is about. Ledley King is a strong character. He won't give up so easily and additionally he never avoids a tackle or a strong challenge. I think he will be great once he comes back and has some luck on his side and avoid injuries