I have had two ACDF, C6&C7 in 2011 (hardware removed) and C5&C6 in 2014. This is the result of injuries from a car accident in 2011. Prior to that, I've not had any neck or spine problems. I was rear-ended again six weeks ago. After four weeks of pain and PT, I saw my Neurosurgeon to get his opinion. He ordered a CT to check on my previous surgery. Evidently, the solid fusion at C6C7 has completely broken horizontally, through and through. The head of one of the screws at C5C6 has also broken off. I'm waiting for my doctor to call me back, since I'm basically walking around with a broken neck. Has anyone ever heard of this? I'm assuming that I will need surgery again, but am a little worried about the severity of my injuries. Any advice, information would be greatly appreciated. I can't find any information on this on the web anywhere.