A 70 year old man comes to the physician complaining about back pain that he has had for the past 8 months. He states that the back pain is located in the lower region. He states that he has an intermittent dull pain that becomes better when he bends forward and gets worse when he extends back. His medical history includes hypertension, hyperlipidemia, and diabetes mellitus. His medications include aspirin, losartan, metformin and atorvastatin. On physical exam, his pedal pulses are full and palpable. The straight leg test is negative.

You suspect lumbar spinal stenosis. How would you confirm this diagnosis?

• A) MRI of spine
• B) X-ray of spine
• C) EMG
• D) CT of the chest
• E) check for rheumatoid factor