6 Days after right side L5s1 Microdisectomy....pain in LEFT buttock centered and not radiating...excruciating lasts 1/2 hour, Steroids help.?

Possibly... Oral steroids are often prescribed although their benefit is less than clear. A recent study showed that they improve function, but not necessarily pain in patients with radicular symptoms (ie: pain radiating down the leg). The pain you are experiencing may be related to back spasm as a result of the surgery and will likely improve with time.