Specialists have said that it is often difficult to determine from X-rays whether the bone is completely healed, but that there are some signs, including whether there is any pain in the spot where the collarbone was cracked. In a lot of cases, they said, they have to rely on the time-tested guideline that a bone usually needs four or more weeks to heal.
Rodgers said that until the medical staff is convinced he isn't in danger of suffering the same - or worse - injury due to instability of the bone, he won't be cleared. He is being allowed to practice this week, but Matt Flynn will be groomed to be the starter and Rodgers would have to make tremendous advancements in strength and range of motion.
Even then, McKenzie has to be comfortable the collarbone is healthy.