Thanks for writing to us.
Sudden onset back pain may be due to disc rupture. Lipping of the vertebral body indicates degenerative changes and called osteophyte
formation. X-rays not of not much help in disc prolapse
and you may need to get MRI spine to diagnose the problem. Please consult a spine specialist and get thorough exam. It important to know the pain pattern, any leg pain, previous episode if any.
Till that period continue percocet with muscle relaxant
and physical therapy
if possible. Take some rest which is crucial.