Neurogenic Claudication Symptoms but MRI does not note stenotic canal
degenerative spondylolisthesis present

Some LRS on L but does not explain no canal stenosis-Neurogenic Claudication

Look at Spine Alignment on Sag Films and Facet Gap on Axials  Remember that MRI is Performed in Supine Position-Gravity Reduces Slip So No Canal Compromise  When Supine, Slip Occurs With Standing-narrows canal