That is DEFINITELY something to ask about...thank you for the information!
I did not read the thread but I would suggest a Neurologist working in close consultation with an Orthopedic Surgeon. And get three opinions. Prayers to your complete recovery.
http://medicalmalpractice.levinperconti.com/2012/10/new_lawsuits_alleging_defectiv.html
Do dig a lot deeper, with your health that device could kill you.