There are many causes for spinal stenosis but degenerative changes are a precursor to spinal stenosis becoming symptomatic. While the exact prevalence of degenerative LSS is unknown, it is estimated that it ranges from 1.7% - 13.1%. However, the results from these statistics have been put into question. This is mainly due to unclear diagnostic criteria. For example, magnetic resonance imaging (MRI) and computed tomography (CT) are the most common ways to diagnosis LSS, but clinically significant definitions of canal, foraminal, or subarticular narrowing do not exist.