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Spinal stenosis is the narrowing of spaces in the spine (backbone) which causes pressure on the spinal cord and nerves. About 75% of cases of spinal stenosis occur in the low back (lumbar spine).
The erector spinae (/Ëáµ»ËrÉktÉr ËspaÉªniË/ É-REK-tÉr SPEYE-nee) or spinal erectors is a set of muscles that straighten and rotate the back.