Hi Dave,
I don't really see why it would be impossible to do 50 lb dumbbells, but it is always a question about if you want to risk it or not. Is lifting those dumbbells your profession that brings you bread on the table, then yes, you can do it. But if it is a hobby that you do to have fun and keep healthy, then why not just use smaller dumbbells and stay safe? I am not expert on the cervical spine (I have studied more on the lumbar), but I can make an educated guess that the larger the weight of the dumbbell, the larger the torque that is transferred to your spine, even if you are not directly using the neck for the lifting.
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2015 Lost ability to sit
2016 Gradually worsening despite conservative treatment
2016 L4-L5, L5-S1 activ L success!
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