Why Do Spinal Surgery Rates Continue To Rise?
A Chiro.Org Editorial
First, let’s review some history. In 1974, the Congressional Committee on Interstate and Foreign Commerce held hearings on unnecessary surgery. Their findings from the First Surgical Second Opinion Program found that 17.6% of recommendations for surgery were not confirmed. The House Subcommittee on Oversight and Investigations extrapolated these figures to estimate that, on a nationwide basis, there were 2.4 million unnecessary surgeries performed every year, resulting in 11,900 deaths, at an annual cost of $3.9 billion. 
With the total number of lower back surgeries having been estimated in 1995 to exceed 250,000 in the U.S., at a hospital cost of $11,000 per patient.  This could suggest that the total number of unnecessary back surgeries each year in the U.S. could be 44,000, costing as much as $484 million. 
So, the first risk of spinal surgery is that it may not be necessary.
A most-recent review suggests that: