As a Sports Physical Therapist and Athletic Trainer here is my take:
1. Those of you trashing the OP and his idea that the front office had concerns about the leg need to step off.
2. The initial fracture was NOT surgically repaired, which really surprises me with the complexity of the fracture. Whether that was Earl's decision entirely, or at the suggestion of the Seahawks' medical staff is unknown. However with that being the case I suspect that the Hawks have done imaging on the leg multiple times since then and realized that the fracture did not heal correctly. A healthy bone is not supposed to break under the type of pressure that it did yesterday (he simply planted hard and no contact involved, the fracture happened before he got to the receiver).
3. I think that the offseason and his contract/trade situation played out the way it did because they knew the tibia wasn't right. They didn't offer him a long term deal, knowing that the leg could go again at any time (as evidenced yesterday unfortunately). They also didn't trade him because opposing teams would have also done imaging on the leg, and he likely would have failed a physical anyways making the trade null and void. So my educated guess is that he Hawks decided to keep him, see what they could get out of him for the year and hope for the best knowing full well that this was a possibility and maybe even likely.
4. The good news for Earl is that if the leg is surgically repaired this time (a rod inserted in the tibia) then it significantly increases the likelihood that the fracture heals correctly. With that being the case he still has good years left in the NFL, should pass physicals with teams wanting to sign him in the offseason, and should be able to get a sizeable pay day like he has wanted for the past few months. It just will almost assuredly be somewhere other than Seattle.
Come at me bro.