Not always as straightforward as that OF. Sometimes an old injury can be set off by getting out of bed the wrong side. there's talk of back spasms, and I've been there. Everything can have been great for a couple of years but then something happens and it's back with a vengeance. What i would say is that as soon as there was any discomfort, Pieterson should have been withdrawn immediately. It seems incredible that he was batting in pain, then spent a full day in the field as well.